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This is one of the weirdest mysteries of human evolution: Why do we have grandmas? From menopause to our slow maturation and super-long lifespans, humans are quite unique in the animal kingdom. Could grandma be an evolutionary secret weapon? Or is she just a surprise side effect of living long lives?

Thank you to @MamaDoctorJones Go check out her channel!

References: https://sites.google.com/view/....mystery-menopause-re

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Chapters:
0:00 Intro: Humans are weird
0:45 Nature's strangest life cycles
2:25 The whole point of evolution
4:48 The mystery of grandmas (it's menopause)
6:02 Mama Doctor Jones explains the female reproductive system
8:55 Why do humans live so long after reproductive age?
10:46 The Grandmother Hypothesis
12:50 There's just one catch… and a NEW theory!
15:12 Putting it all together
17:00 A word from our sponsor


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This video shows how exponents can be used more generally with variables. It explains why x⁰=1 and shows how to solve very simple algebraic equations involving exponents and roots.

Part of the Algebra Basics Series:
https://www.youtube.com/watch?v=NybHckSEQBI&list=PLUPEBWbAHUszT_GebJK23JHdd_Bss1N-G

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Humans have a hard time with really big numbers, especially when it comes to DEEP TIME. The history of the Earth took a lot longer than you think, trust me. But I’m here to help you put it in perspective. With some string.

REFERENCES:
http://bit.ly/DeepTimeRefs

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It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D.
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Produced by PBS Digital Studios
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Mammals for kids is a fun engaging video that will help students learn all about the characteristics of mammals and what mammals really are! We quickly introduce animal classification and the difference between the types of animals but we mostly focus on what makes mammals unique in this video. From being warm blooded, to giving birth to live offspring we cover it all!

When you are done watching the video we invite you to come and download our free lesson plans about mammals that will help cement the learning. We have lesson plans that will help students from 1st grade to 3rd grade learn about animal classifications and how to identify the different kinds of animals. Check them out below:

Mammals and Reptiles Lesson plan (adaptable for 1st, 2nd, and 3rd Grade): https://learnbright.org/lesson....s/science/reptiles-a

Identify Animals lesson plan (2nd and 3rd Grade):
https://learnbright.org/lesson....s/science/identify-a

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*Teachers and Parents! Did you know? In addition to these great videos, we have also created a library of high quality and engaging lessons for your elementary aged student(s). Visit us, sign up for a free account, and instantly you'll have access to thousands of lesson plans, learning materials, teaching instructions, activities, and assignments that your kids will really enjoy! We hope to see you soon!

Browse our entire collection of Science lesson plans: https://learnbright.org/lessons/?filter_subject=science

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Check out American Veteran on @pbsvoices ►► https://youtu.be/P8bt1bwllZg
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The biggest thing that has ever lived on Earth… is a tree? Hard to believe, but it’s true. Travel with me to the Rocky Mountains of Colorado to go inside a giant aspen clone, the most massive species on our planet, and learn what unique and special evolutionary adaptations let them get so big.

Thanks to Dr. Jeffry B. Mitton (UC-Boulder) for sharing his years of research into giant quaking aspens and for telling us where to go see such pretty fall colors

References:

Mitton, J. B. & Grant, M. C. Observations on the Ecology and Evolution of Quaking Aspen, Populus tremuloides, in the Colorado Front Range. 9 (2021).

Mitton, J. B. & Grant, M. C. Genetic Variation and the Natural History of Quaking Aspen. BioScience 46, 25–31 (1996).

Grant, M. C., Mitton, J. B. & Linhart, Yan. B. Even larger organisms. Nature 360, 216–216 (1992).

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(footage provided by Library of Congress)
Have you ever wondered what life would be like if you could not see or hear anything? That was life for a woman named Helen Keller. In this video for kids, you will learn about the life and accomplishments of this incredible historical figure. Even today, her story and lasting impact are inspiring.

Helen Keller was born in Alabama on June 27, 1880. When she was a little under 2 years old, she fell ill to meningitis and lost both her sight and hearing. She hadn't yet learned how to speak. Her parents knew she would need special help and found that assistance through Anne Sullivan.

Anne Sullivan had been blind herself once but received it back after a surgery. She wanted Helen to live a normal life and began teaching and helping her at age 7. She would remain Helen's helper and companion for over 50 years! Anne first taught Helen words by placing an object in one of Helen's hands and using sign language to spell out the word in the other hand. In other words, she used Helen's sense of touch to teach her words.

Another teacher named Sarah Fuller helped Helen learn how to speak by using the vibrations of words on her own lips. Helen learned how to feel the vibrations and get a sense of how her own lips moved to make her own sounds. Eventually, she was able to speak as anyone else. She also learned how to read using Braille.

We hope you and your student(s) enjoyed learning about Helen Keller! If you want even more information, head over to our website and download one of our many free lesson plans, full of activities, worksheets, and more!

https://learnbright.org/lesson....s/social-studies/hel

What you will learn in Who Is Helen Keller for Kids:
0:00 Introduction to Helen Keller
0:38 How Helen Keller became deaf and blind
1:19 Anne Sullivan—Helen's companion and helper
2:01 How Anne Sullivan and Sarah Fuller helped Helen communicate
3:20 Helen Keller in college
4:15 Helen helps others with disabilities
5:21 Review of the facts

Thank you for watching and learning with us! We’re constantly releasing new content and videos, so click that “Subscribe” button and you’ll get notified.

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Browse our entire collection of Social Studies lesson plans: https://learnbright.org/lessons/?filter_subject=social-studies

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Optical illusions are fun, but they can also teach us a lot about how our brains work. In particular, how our brains accomplish the incredible feat of constructing a three-dimensional reality using nothing but 2-D images from our eyes. A young artist and psychology researcher named Adelbert Ames, Jr. developed a series of illusions that help us understand how this process of constructing reality actually works. Sometimes we need to be fooled in order to gain understanding.

We'd like to acknowledge Dr. Phil Kellman from UCLA for his helpful discussions about the principles of spatial perception at play in these illusions https://kellmanlab.psych.ucla.edu/

Special thanks to Brian from Real Engineering for 3D printing the anamorphic cube for me! https://www.youtube.com/c/RealEngineering

References used in this episode: https://sites.google.com/view/....references-ames-illu

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In this video we cover the life of Christopher Columbus for kids! This video teaches kids about Christopher Columbus, who he was, why he thought he could sail west to Asia, and what actually happened on his voyage across the Atlantic Ocean.

It's hard to imagine because it was so long ago in history, many people thought a person could come aboard a ship in Europe, sail west, and end up in a port in Asia. Columbus was not the first to think this was possible, but he may be the best known because he left journals and logs of his trip. We hope you enjoy learning about this important part of history with us.

After watching the video, if you want even more learning activities, worksheets, or teaching ideas then head over to our website and download our FREE comprehensive lesson plan all about Christopher Columbus. You can download it here: https://learnbright.org/lesson....s/social-studies/col

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You probably know about weather, but do you know what it actually is, how it works, and why it changes depending on where you are in the world? In Weather for Kids, you will learn that there are a number of factors that affect the weather outside. It's not just about how hot or cold it is. Think about what it feels and looks apart from hot or cold, such as wet or dry, clear or cloudy, and calm or stormy. This video discusses what causes all of these effects.

You can use a thermometer to figure out how hot or cold it is outside quite easily. Should you weather a coat? Or is it time for a swim and a swimming suit would be more appropriate? Temperature is only one factor that affects the weather. Have you ever heard of humidity? The amount of water vapor in the air determines the humidity levels. Humidity refers to how wet or dry it is outside. The weather in hot desert likely has a very low humidity level, if any at all. However, in a tropical rainforest, even if it's warm as well, it may be very wet instead of dry.

Another factor is air pressure. What air pressure affects is the presence of clouds. Basically, places that experience high pressure will show clear skies. Areas with low pressure have lots of clouds. To measure air pressure, you would need a barometer. Finally, there is the factor of wind. Wind and wind speed relate to storms. If it's calm outside, it is likely that there isn't much wind. Or if there is, it's not very quick; it's a light breeze. On the other hand, storms imply a lot of fast wind. Have you ever noticed that when it's stormy, you also tend to feel the wind?

We hope you and your student(s) enjoyed learning about these four different landforms! If you want to learn even more, head over to our website and download one of our many free lesson plans about landforms, full of activities, worksheets, and more!

https://learnbright.org/lesson....s/science/introducti

What you will learn in Weather for Kids:
0:00 Introduction to weather and what it is
1:06 Factors that affect the weather
1:54 How meteorologists study and predict the weather
2:30 Temperature: hot or cold
3:19 Humidity: wet or dry
4:08 Air (atmospheric) pressure: clear or cloudy
5:15 Wind presence and speed: calm or stormy
6:13 Review of the facts

Thank you for watching and learning with us! We’re constantly releasing new content and videos, so click that “Subscribe” button and you’ll get notified.

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“In Our Nature” is a NEW special limited series on It’s Okay To Be Smart!
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Seemingly distant ecosystems, even half a world apart, are connected in surprising ways. In this special limited series, Emily Graslie and Trace Dominguez join me as we explore the universal rules of life that tie together Earth’s living systems. In episode 2, we study the complex family relationships of elephants in Africa’s Serengeti plains and how their shared knowledge can help them survive. Then we travel to San Francisco to discover how the intricate songs of birds have changed in the face of our own culture. How common is culture in the animal kingdom? And what role does it play in the survival of species?

References: https://sites.google.com/view/....in-our-nature-episod

00:00 Intro
00:45 What is culture?
02:42 Do animals have culture?
03:33 Serengeti: Culture in African elephants
14:18 San Francisco: Culture in urban songbirds
23:34 Conclusion

In Our Nature is a special miniseries produced by It’s Okay To Be Smart for PBS. Stay tuned for more episodes coming this summer, here on our YouTube channel!

Original Production Funding provided by: Anne Ray Foundation, a Margaret A. Cargill Philanthropy

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In a random number, can you figure out what the place value of any digit in that number is? In this video, you and your kids will learn about place value and how to determine the place value of any digit.

Naming place values is quite easy once you recognize the patterns. And this video will help you figure out what those patterns are! It describes using a place value chart to keep track of where numbers fall. A chart can have many place value columns. We will focus on the ones, tens, and hundreds in this video. You will learn that when it comes to whole numbers, you will always place the last digit in the ones column. That is the column furthest to the right.

The video goes through several examples of figuring out place value of the digits in numbers. For instance, in the number 786, you can use that rule of placing the final digit in the ones column to figure out the place value of the other numbers. If 6 is in the ones place, then 8 is in the tens place, and 7 is in the hundreds place. It really is that easy!

We hope you and your student(s) enjoyed learning about place values! If you want even more information, head over to our website and download one of our many free lesson plans, full of activities, worksheets, and more!

https://learnbright.org/lessons/math/place-value/
https://learnbright.org/lesson....s/math/place-value-s
https://learnbright.org/lesson....s/math/place-value-t
https://learnbright.org/lesson....s/math/introduction-

What you will learn in this video:
0:00 Introduction to place values and digits
1:04 Place value chart
2:23 How to add using place value chart
3:22 Quick quiz
4:07 Place values after hundreds
5:14 Final questions for review

Check out some of our other videos related to place values here:
Graphs: https://youtu.be/bmY28wdGL9M

Thank you for watching and learning with us! We’re constantly releasing new content and videos, so click that “Subscribe” button and you’ll get notified.

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*Teachers and Parents! Did you know? In addition to these great videos, we have also created a library of high-quality and engaging lessons for your elementary aged student(s). Visit us and sign up for a free account, and you'll instantly have access to thousands of lesson plans, learning materials, teaching instructions, activities, and assignments that your kids will really enjoy! We hope to see you soon!

Browse our entire collection of Math lesson plans:
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#ASL
#PlaceValueForKids
#WhatIsPlaceValue
#PlaceValue

In this video your students and kids will learn how animals are classified into different groups. Classification breaks very large groups down into smaller groups. This makes them easier to be studied. Scientists classify animals, plants and insects based on things they have in common. Just like kids would do with their toys!

Taxonomy means to classify living things. Scientists and biologists use a taxonomy chart to classify all the organisms on Earth. This chart includes the following groups: Domain, Kingdom, Phylum, Class, Order, Family, Genus and Species. Throughout the video we will learn about the different taxonomies, how animals are classified and spend a little more time on vertebrates and invertebrates. By the end you kid will have a more solid understanding of what makes animals different and may be able to classify them into their proper taxonomies.

Would you like even more Animal Classification Learning resources? Download our free comprehensive lesson plans here: https://learnbright.org/?s=animal+classification here you'll find access to lots more content, worksheets, learning activities and more.

Thank you for watching and learning with us! We’re constantly releasing new content and videos, so click that “Subscribe” button and you’ll get notified.

Follow us across the web!

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Are you a K-6 grade teacher looking for more teaching resources? We don’t only provide video content but high quality lesson plans as well. 100% free with handouts, worksheets, classroom activities and more!

Browse our entire collection of Science lesson plans: https://learnbright.org/lessons/?filter_subject=science

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Class 5 - Mathematics - Chapter 3 - Lecture 1 - Addition & Subtraction of Fractions - Allied Schools

What would it be like to work for 16 hours a day, days a week? Nowadays, that is very uncommon in the United States. But during colonial times, that was the way life was for most people. In Colonial Times for Kids, you will learn about the daily life and habits of people who lived during this period of American history.

Let's start by talking about the children and what typical life was like for them. They had the chance to go to school, but they had better access to education if they lived in the city rather than on a farm. Many farm children learned to read and write from their father or church minister. Wealthier families might hire special tutors to teach their kids or send them to schools in England. Boys and girls did not have the same educational opportunities, though. In fact, many girls never learned to read or write.

Unfortunately, this was also a time during which people employed indentured servants, laborers brought over from Britain, or owned slaves. Indentured servants agreed to work for about seven years in return for their passage to America. But slavery grew in the colonies because the indentured servants were not easy to control and more difficult and costly to obtain. Some of the first African American indentured servants were forced into slavery rather than gaining their freedom after the seven-year work period.

Houses of this era were generally small, sometimes containing just a single room. The frames were made of wood, roofs of dried grasses, and floors of dirt. A fireplace inside was used for cooking and producing heat during the winter. Eventually homes on plantations grew larger, adorned with glass windows, wooden or carpeted floors, and quality furniture.

We hope you and your student(s) enjoyed learning about this period in American history! If you want even more information, head over to our website and download one of our many lesson plans, full of activities, worksheets, and more!

https://learnbright.org/lesson....s/social-studies/col

What you will learn in this video:
0:00 Introduction to this period
0:23 Farm life
1:41 Life for colonist children
2:20 Colonists in the city
3:37 Jobs of men depended on where they lived
4:42 Colonial terms for level of profession
5:25 Importance of religion
6:28 The Revolutionary War
7:17 Indentured servants and slavery
8:24 Construction of the farm homes

Thank you for watching and learning with us! We’re constantly releasing new content and videos, so click that “Subscribe” button and you’ll get notified.

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*Teachers and Parents! Did you know? In addition to these great videos, we have also created a library of high-quality and engaging lessons for your elementary aged student(s). Visit us and sign up for a free account, and you'll instantly have access to thousands of lesson plans, learning materials, teaching instructions, activities, and assignments that your kids will really enjoy! We hope to see you soon!

Browse our entire collection of Social Studies lesson plans: https://learnbright.org/lessons/?filter_subject=social-studies

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This algebra video tutorial explains how to simplify rational expressions with variables, exponents & fractions by expanding, factoring and canceling.

Algebra Review: https://www.youtube.com/watch?v=i6sbjtJjJ-A

______________________________
Algebra - Free Formula Sheets:
https://www.video-tutor.net/formula-sheets.html

Rational Functions - More Lessons:
https://www.video-tutor.net/ra....tional-functions.htm

Final Exam and Test Prep Videos:
https://bit.ly/41WNmI9

Martin Luther King Jr for Kids is a short documentary and overview about the great civil rights leader. Together we will learn about the monumental impact he had and still has throughout the world.

MLK – They are three letters representing the Civil Rights movement in America during the 1950s and 1960s. Of course, the letters belong to the name- Martin Luther King Jr. Nearly everyone has heard of this Civil Rights leader, but many people do not know the journey of his life.

They see him as the person honored on the 3rd Monday in January
each year, giving a day off from school or work. However, there is much more to be known about this great leader, including his early life, education, religious background, civil rights activities, and much more.

To download an accompanying FREE lesson plan about Martin Luther King Jr please visit us at:
https://learnbright.org/lesson....s/social-studies/mar

We hope you enjoy!

Thank you for watching and learning with us! We’re constantly releasing new content and videos so click that “Subscribe” button and you’ll notified.

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*Teachers and Parents! Did you know? In addition to these great videos, we have also created a library of high quality and engaging lessons for your elementary aged student(s). Visit us, sign up for a free account, and instantly you'll have access to thousands of lesson plans, learning materials, teaching instructions, activities, and assignments that your kids will really enjoy! We hope to see you soon!

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This video is an introductory lesson on the concept of ratios.

Covered in this video:
* What are ratios
* How ratios are written
* Examples of finding ratios
* How ratios are used in the real world

Ratios Grade 4, Ratios Grade 5, Ratios Grade 6

Other Videos Mentioned:

* A Step by Step Guide to Simplifying Ratios: https://youtu.be/mhcIH3iKKmE
* Factors and the Greatest Common Factor: https://youtu.be/RaWciR9iyyU

Check out my post on the basics of ratios as well as a free printable worksheet here: https://improvedmath.com/an-in....troduction-to-ratios

Improved math is a channel created to provide additional instruction on essential math concepts. I’m not a math teacher, I’m an accountant. But, I know firsthand how important math concepts are in the real world.

Teachers, parents, guardians, homeschoolers, and students can use these videos to help reinforce math skills.

For more information on math topics or for free additional resources, you can also visit my website at improvedmath.com

https://www.youtube.com/c/ImprovedMath

https://www.tiktok.com/@improvedmath1?

https://www.pinterest.com/improvedmath/

Don’t forget to like, share, and subscribe!

#introductiontoratios
#basicratios
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#ratiosexplained

Imagine having to hide in a secret hidden room to protect yourself and your family. That's what Anne Frank and her family had to do during World War II. In this video for kids, you will learn a lot about Anne Frank, an incredible individual who endured unimaginable suffering like so many other Jewish people during this time in history.

Anne Frank was born in Germany in 1929 to Otto and Edith Frank. She also had a sister named Margot. Otto's family, who was Jewish, had lived in Germany for many generations. Because Adolph Hitler, who hated Jews, gained control of the German government, the Franks had to move to the Netherlands. For a few years, life was pretty normal, but the family was unable to escape to the United States or England before the war started in 1939 and before the war spread to the Netherlands.

Jewish people had to endure immense persecution over the next couple years. There was always a threat of being sent to concentration camps. The Frank family decided to go into hiding. Otto, his family, and some friends moved to a secret annex in 1942, when Anne was just 13 years old. They lived there for a couple years, and Anne started writing a diary about her experiences. She hoped one day to publish it as The Secret Annex and become a famous writer.

Unfortunately, Anne Frank and her family were discovered in August of 1944 and arrested. They were sent to concentration camps a month later. Anne and her sister died of typhus in March of 1945, just two months before the end of the war. Of all the individuals who lived in the secret annex, Otto was the only one to survive. Miep Gies, a woman who had hidden Anne's diary when the Franks were arrested, gave the diary to Otto, who published it under the title The Secret Annex. Anne's wish came true—she became a famous writer whose book has sold over 30 million copies and been translated into 70 languages.

We hope you and your student(s) enjoyed learning about Anne Frank! If you want even more information, head over to our website and download one of our many free lesson plans, full of activities, worksheets, and more!

https://learnbright.org/lesson....s/social-studies/ann

What you will learn in Who Was Anne Frank?:
0:00 Introduction to who Anne Frank was
0:40 Childhood of Anne Frank and rise of Nazi party
1:49 Living in the Netherlands and start of WWII
2:45 What Jewish people had to do near beginning of the war
3:45 The Secret Annex
4:51 Anne keeps a diary
5:21 The Franks and others discovered
6:19 War ends and publication of Anne's diary
7:27 Reflection questions

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*Teachers and Parents! Did you know? In addition to these great videos, we have also created a library of high-quality and engaging lessons for your elementary aged student(s). Visit us and sign up for a free account, and you'll instantly have access to thousands of lesson plans, learning materials, teaching instructions, activities, and assignments that your kids will really enjoy! We hope to see you soon!

Browse our entire collection of Social Studies lesson plans: https://learnbright.org/lessons/?filter_subject=social-studies

#ASL
#AnneFrank
#WWII

This video tutorial covers everything you need to know to start converting improper fractions to mixed numbers.

In this video we cover:

What are improper fractions and mixed numbers?
Visual showing the difference between improper fractions and mixed number
The steps required to convert improper fractions to mixed numbers
Examples of converting improper fractions to mixed numbers

Other Videos Mentioned:
A Step by Step Guide to Simplifying Fractions: https://youtu.be/E_81dn_OYOA
Converting Mixed Numbers to Improper Fractions: https://youtu.be/p0NMJLjt_ns

Check out my post and free printable worksheet on converting improper fractions to a mixed number here: https://improvedmath.com/how-t....o-convert-improper-f

Improved math is a channel created to provide additional instruction on essential math concepts. I’m not a math teacher, I’m an accountant. I know firsthand how important math concepts are in the real world.

Teachers, parents, guardians, homeschoolers, and students can use these videos to help reinforce math skills.

For more information on math topics or for free additional resources, you can also visit my website at improvedmath.com

https://www.youtube.com/c/ImprovedMath

https://improvedmath.com

https://www.tiktok.com/@improvedmath1?

https://www.pinterest.com/improvedmath/
Don’t forget to like, share, and subscribe!

#improperfractions
#mixednumbers
#mathtips
#mathtricks
#mathvideos
#learnmath
#homeschoolmath
#virtualmath

What does it take to make a rainbow? Are there two points at which the rainbow touches the earth's surface? In this video for kids, you will learn all about the science behind how a rainbow forms. It takes three simple ingredients: light, water, and you!

Light is important because rainbows are actually made of light. The white light we see from the sun actually contains seven colors: red, orange, yellow, green, blue, indigo, and violet. When light enters a raindrop, it bends or refracts, and all the colors band together on the other side. That's what makes the light appear in a ribbon of color.

Rainbows appear in an arc shape. When the sun is low in the sky, the arc looks tall. When the sun is higher up, the arc of the rainbow is lower. But believe it or not, rainbows don't have an arc shape. It's an optical illusion! If you are in an airplane and you see a rainbow, it will be in a circular shape. All rainbows are circular.

Some rainbows appear at night, and we call these moonbows. Moonbows appear as a faint circle around the moon. They are usually not easy to see, and sometimes they even look white instead of colorful. There are also double rainbows and upside-down rainbows. Upside-down are very rare, and they actually only occur when light bends through the thin screen of tiny ice crystals high in the sky.

We hope you and your student(s) enjoyed learning about this beautiful natural phenomenon! If you want to learn even more, head over to our website and download one of our many lesson plans about rainbows and light, full of activities, worksheets, and more!

https://learnbright.org/lessons/science/rainbows/
https://learnbright.org/lesson....s/science/rainbows-s
https://learnbright.org/lessons/science/light/
https://learnbright.org/lesson....s/science/properties
https://learnbright.org/lesson....s/science/reflection

Thank you for watching and learning with us! We’re constantly releasing new content and videos, so click that “Subscribe” button and you’ll get notified.

What you will learn in What Is a Rainbow?:
0:00 Introduction
0:41 Importance of light for rainbows
1:24 Refraction of light
2:23 White light and the visible light spectrum
3:41 How rainbows work
4:20 Shape of a rainbow
5:21 Double and upside rainbows
6:33 Experiment time
7:03 Review of the facts

Find and Follow Us Online:
Facebook: https://www.facebook.com/LearnBright/
Instagram: https://instagram.com/LearnBrightEducation
Pinterest: https://pinterest.com/LearnBrightEducation
YouTube: @LearnBright
Website: https://learnbright.org/

*Teachers and Parents! Did you know? In addition to these great videos, we have also created a library of high-quality and engaging lessons for your elementary aged student(s). Visit us, sign up for a free account, and instantly you'll have access to thousands of lesson plans, learning materials, teaching instructions, activities, and assignments that your kids will really enjoy! We hope to see you soon!

Browse our entire collection of Science lesson plans: https://learnbright.org/lessons/?filter_subject=science

#Rainbows
#RainbowsForKids
#Light