Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate

Go to http://Raceforretirement.com and see how the action gap affects you.
Follow all of our Peru adventures on this playlist: http://bit.ly/SmartPeru
↓ More info and sources below ↓

Special thanks to Rainforest Expeditions for hosting us! Visit http://www.perunature.com/

References:
Wilson, E.O. "The Diversity of Life" http://eowilsonfoundation.org/....the-diversity-of-lif

Eichhorn, Markus P. "Latitudinal gradients." Natural Systems: The organisation of life: 249-264.

"Tropical Ecology" (textbook) by John Kircher (2011) http://press.princeton.edu/titles/9486.html

Condamine, Fabien L., et al. "What causes latitudinal gradients in species diversity? Evolutionary processes and ecological constraints on swallowtail biodiversity." Ecology letters 15.3 (2012): 267-277.

Jenkins, Clinton N., Stuart L. Pimm, and Lucas N. Joppa. "Global patterns of terrestrial vertebrate diversity and conservation." Proceedings of the National Academy of Sciences 110.28 (2013): E2602-E2610.

Mannion, Philip D., et al. "The latitudinal biodiversity gradient through deep time." Trends in ecology & evolution 29.1 (2014): 42-50.

Mittelbach, Gary G., et al. "Evolution and the latitudinal diversity gradient: speciation, extinction and biogeography." Ecology letters 10.4 (2007): 315-331.

Wiens, John J., et al. "Evolutionary and ecological causes of the latitudinal diversity gradient in hylid frogs: treefrog trees unearth the roots of high tropical diversity." The American Naturalist 168.5 (2006): 579-596.


----------------
It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.D.
Have an idea for an episode or an amazing science question you want answered? Leave a comment or check us out at the links below!
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And where do they keep their suitcases?

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As winter approaches, V-shaped flocks glide overhead as the world's birds begin their long treks to warmer climates. Humans used to have some pretty crazy theories about where birds went for winter, like the moon, or to the bottom of the ocean.

How did we learn the real story? And where DO birds go for winter? What are the longest bird migrations? How do birds store up energy for their long journey? How do birds navigate? Why do they fly in a V-shape?

Find out in this week's video!

Charles Morton's theory of birds on the moon: http://wrd.cm/1xMKc5k
Read Charles Morton's original 1703 pamphlet! http://bit.ly/1C5AKhk
The story of the stork with a spear in its neck: http://bit.ly/11PgkIs
Aristotle's theory of bird transmutation: http://bit.ly/1uwQwHX
The "barnacle goose" http://bit.ly/1C5BiUg

The Arctic tern's record-breaking migration: http://www.ncbi.nlm.nih.gov/pm....c/articles/PMC283666
The bar-tailed godwit's fat-fueled migration: https://sora.unm.edu/sites/def....ault/files/journals/
Ruby-throated hummingbird mighty migration: http://www.ncbi.nlm.nih.gov/pm....c/articles/PMC132505

The avian aerodynamics of the "flying V" http://bit.ly/1vFFlUs
The many senses that birds use to find their way: http://bit.ly/11qN9vr
How birds use magnetic fields to navigate: http://bit.ly/1r2jYLy

Produced for PBS Digital Studios

Joe Hanson - Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
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Stock images by Shutterstock

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Bees see the world in some very interesting ways
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To begin this video, we launched a little confetti to celebrate the fact that I am now "Dr. Joe", since I successfully defended my Ph.D. in molecular biology! Woo! But you don't have to call me "Doctor."

Anyway, spring is in the air!! We're all thawing out from winter's chill, and for bees and flowers this season is about one thing: Feeding and fertilizing. Bees are amazing social insects, and their relationship with flowers is one of nature's coolest examples of "mutualism". It got me wondering: How do bees see the world? Enjoy this look at how bees see in ultraviolet and even sense electric fields!

References for this episode: http://dft.ba/-5Am1

Written and hosted by Joe Hanson
Produced by Painted On Productions (http://www.paintedon.com/)

Clips used:
Louie Schwartzberg - The hidden beauty of pollination https://vimeo.com/27328081
Jay Woo - October 1st https://vimeo.com/50513099

Music: Edvard Grieg "Morning Mood"

Special thanks to Klaus Schmitt for allowing us to use his awesome UV flower photos: All images used © Dr Schmitt, Weinheim Germany, http://uvir.eu

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"The Oldest Living Things In The World" by Rachel Sussman:
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Species featured in this video:

Bristlecone pine: http://bit.ly/1o3zW4p
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Llareta: http://bit.ly/1ANGYPC
Black coral: http://bit.ly/1zLWn1s
Barrel sponge: http://bit.ly/1opvDjb
Posidonia sea grass: http://bit.ly/UVoN9u
Pond cypress: http://bit.ly/1okVPY6
"Old Tjikko" spruce: http://bit.ly/1s30eq7
Stromatolites: http://bit.ly/1pyymXs
Siberian Actinobacteria: http://bit.ly/1xUZ5yR

Joe Hanson - Host and writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
Editing/Motion Graphics - Andrew Matthews
Gaffer - John Knudsen

Theme music:
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Stock images via Shutterstock

Produced for PBS Digital Studios

Unless otherwise indicated, all photos are © Rachel Sussman, used with permission

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I took a trip to one of Austin's famous moontowers so I could put the enormity of our solar system into perspective. With the help of a grapefruit, and a lot of walking, you'll get an idea of just how tiny everything is out there!!

Do it yourself! Calculate sizes and distances, and then make your own solar system model using this calculator: http://dft.ba/-solarsystem

Veritasium "How Far Away Is The Moon?" http://youtu.be/Bz9D6xba9Og
Solar system as a football field: http://dft.ba/-6qnn
How far away is Voyager right now? http://voyager.jpl.nasa.gov/

Written and hosted by Joe Hanson
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The fastest animal in nature isn't what you think it is. It's way, way smaller than that. Nature's tiniest creatures warp the laws of physics, and they do it in ways that even human engineers would gawk at. Using the power of super slow-motion macro video, let's uncover the biological engineering that lets nature's fastest creatures do their zoomy thing.

@AntLab ►► https://www.youtube.com/user/adrianalansmith
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References: https://sites.google.com/view/....fastest-animals-refe

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You’ve seen it in the comment section before: “Climate change is natural. It’s happened before and it will keep happening”. In reality, comments like these are the newest kind of climate change denial. In this video we’re going to learn about all the reasons that Earth’s climate changes, natural and otherwise, and then how we know that modern climate change can’t be blamed on natural forces. Maybe we can finally put this biggest myth about climate change in the trash.

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Why are trees and other plants green? Seems like a simple question. But the answer is full of surprises. Using a special camera that can pick up light just beyond the visible range, into the near-infrared, you’ll get to see trees like you’ve never seen them before. And these other-worldly images can teach us not only why trees are green on Earth, but what color photosynthetic life on other planets might be.
#TeamTrees

References: https://sites.google.com/view/....treesonotherplanets-

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Nothing is guaranteed in life except death, taxes, and entropy. What do other life forms have to teach us about staying alive as we get old, and will we ever conquer death?

REFERENCES:

Arias, E. et al. (2013). United States life tables eliminating certain causes of death, 1999–2001. National Vital Statistics Reports 61(9)

De Cecco, M. et al. (2013). Transposable elements become active and mobile in the genomes of aging mammalian somatic tissues. Aging 5(12): 867–883. DOI: 10.18632/aging.100621

Hayflick, L. (2016). Unlike aging, longevity is sexually determined. In Handbook of theories of aging, 3rd ed. (pp. 31-52). New York, NY, Springer.

Hayflick, L. (UCSF School of Medicine). Interview.

Klapper, W. et al. (1998). Longevity of lobsters is linked to ubiquitous telomerase expression. FEBS Letters 439: 143-146

Martinez, D.E. (1998). Mortality patterns suggest lack of senescence in hydra. Experimental Gerontology 33(3): 217–225

Reilly, M.T. et al. (2013). The role of transposable elements in health and diseases of
the central nervous system. The Journal of Neuroscience 33(45): 17577–17586

Roth, A.W. and Polotsky, A.J. (2012). Can we live longer by eating less? A review of caloric restriction and longevity. Maturitas 71: 315–319

Sturm, A. et al. (2015). The mechanism of ageing: primary role of transposable elements in genome disintegration. Cell. Mol. Life Sci. 72:1839–1847

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1. Gravitational waves: http://www.nature.com/news/gra....vitational-waves-1.1
2. AlphaGo beats Lee Sedol: http://www.theatlantic.com/tec....hnology/archive/2016
3. CRISPR tested in a human: http://www.nature.com/news/cri....spr-gene-editing-tes
4. Minimal synthetic organism: http://www.sciencemag.org/news..../2016/03/synthetic-m
5. SpaceX rocket landings: http://www.space.com/33461-spa....cex-rocket-landings-
6. Closest known exoplanet: https://www.eso.org/public/news/eso1629/
7. Alzheimer’s drug trial success: http://www.sciencealert.com/a-....new-alzheimer-s-drug
8. Three-parent baby born: https://www.newscientist.com/a....rticle/2107219-exclu
9. Paris climate agreement goes into effect: https://www.wired.com/2016/12/....2016-pivotal-year-wa
10. Antarctic ozone hole is healing: http://www.bbc.com/news/scienc....e-environment-366749
11. Ross Sea becomes largest marine protected area: http://news.nationalgeographic.....com/2016/10/ross-se
12. Giant pandas are no longer endangeredL http://www.worldwildlife.org/s....tories/giant-panda-n
13. Wild tigers on the rise: http://news.nationalgeographic.....com/2016/04/160410-
14. Cool new species: http://www.livescience.com/545....46-chewbacca-beetle-
http://www.npr.org/sections/th....etwo-way/2016/06/02/
http://www.livescience.com/555....63-game-of-thrones-d
http://www.bbc.com/news/world-asia-38325099
15. Casper the ghost octopus: http://www.slate.com/blogs/the...._slatest/2016/03/06/

16. Ghost shark filmed: http://news.nationalgeographic.....com/2016/12/pointy-
17. LIchen symbiosis decoded: http://www.theatlantic.com/sci....ence/archive/2016/07
18. Jeremy the backwards snail finds a partner: http://www.wired.co.uk/article..../snail-jeremy-left-h
19. Solar powered plane flies around world: https://www.theguardian.com/en....vironment/2016/jul/2
20. New glasses for colorblind people: https://www.technologyreview.c....om/s/601782/how-ench
21. Juno mission updates: https://www.missionjuno.swri.edu/
22. Rosetta completes comet mission: http://gizmodo.com/watch-roset....ta-s-entire-mission-
23. Scott Kelly and Mikhail Kornienko’s year in space: https://www.nasa.gov/content/a-year-in-space

----------------
It’s Okay To Be Smart is written and hosted by Joe Hanson, Ph.D.
Have an idea for an episode or an amazing science question you want answered? Leave a comment or check us out at the links below!
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Produced by PBS Digital Studios
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Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/ma....th/arithmetic-home/a

For more like this go to https://www.letsdomath.ca/
It's an easy-to-use route to resources, faster than scrolling through videos on YT!

Before you come to this, you need to be confident making new equivalent fractions.

Quick review of how to add fractions when they have the same denominator
(0:21 - 0:36) Demo of adding 2 fractions with different denominators, using fractions model diagrams. 1/4 + 1/2
(0:46 - 1:33) Then, keeping that model in view, we dip into our Fractions Skill-kit to make a common denominator, and THEN we add.
(2:03 - 3:25) Problem 2: 5/6 + 2/3 = 1/2
(3:33 - 5:28) Problem 3: 1/3 + 1/6 + 5/8
If you CAN reduce, you MUST reduce, for your final answer. No improper fractions in your answer.
As always, if it helps you, please help me... with a Thumbs-Up.
Thanks very much!

This is our Tiny Tune all about fractions. In this video we look at how divide up a whole into equal parts to give us a denominator. Then the parts that we want to count are called the numerator. Together these give us a fraction. The song gives some simple demonstrations and has a few examples at the end for students to have a go at themselves.

Song Written and Performed by Nathan J Laud.
Animation by Squash & Stretch Animation Ltd.
Copyright 2019 Nathan J Laud/Tiny Tunes: All rights reserved.
This is an ORIGINAL song written in 2019 - any copying is illegal.

If you like our songs please subscribe to hear more
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#TinyTunes #NumberSongs #Fractions

Song lyrics
What is a fraction?
We use them for counting part of something,
and all of that something we call a whole.
Then we divide up the whole into equal parts
and we call that the denominator.
And then the parts that we want to count, the numerator.

We are fractions,
we are fractions.
The part of a whole that we want to count,
is a fraction.

If you take a whole pizza,
and cut it up into equal slices.
Then the number of slices goes under then line.
And then your friend comes along and eats up two slices,
and that leaves you with six.
And then the six goes on top,
and we're left with six eights of a pizza.

We are fractions,
we are fractions.
The part of a whole that we want to count,
is a fraction.

Take a big bar of chocolate,
that's divided up into twenty-four parts.
That makes the denominator 24.
And if we break off eight of those chunks of chocolate,
what fraction have we got?
That's right it's eight twenty-forths of a bar of chocolate.

We are fractions,
we are fractions.
The part of a whole that we want to count,
is a fraction.
We are fractions,
we are fractions.
The part of a whole that we want to count,
is a fraction.

Check out the NEW Math Game we made at https://www.MageMath.com/
It is a full video game called Mage Math that helps kids build confidence in math while having tons of fun.

Come learn about fractions for 3rd graders in this fun math video. Help the Number One recharge his space ship with Unit Fractions. This math follows the common core but is basic math that every child needs to know.

We help kids understand a fraction is one part of a whole and that a fraction can only be a fraction if divided into equal parts. We also review the numbers on top are Numerators and the numbers on bottom are the Denominators. The video is great review and introduction to Third Grade Elementary Mathematics involving fractions.

As students progress with division this basic understanding of fractions will help them in their learning.
If you are a teacher this teaches 3.NF.1
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Vintage Culture - Fractions [Tomorrowland Music]
Stream: https://tomorrowland.lnk.to/Fractions

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#tomorrowland #vintageculture #fractions

Using a number line, we'll explain the rule of "invert and multiply" when dividing two fractions.

Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/div-fractions-fractions-pre-alg/e/understanding-dividing-fractions-by-fractions?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra

Watch the next lesson: https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/div-fractions-fractions-pre-alg/v/another-dividing-fractions-example?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra

Missed the previous lesson?
https://www.khanacademy.org/math/pre-algebra/fractions-pre-alg/dividing-fractions-pre-alg/v/dividing-fractions-word-problem?utm_source=YT&utm_medium=Desc&utm_campaign=PreAlgebra

Pre-Algebra on Khan Academy: No way, this isn't your run of the mill arithmetic. This is Pre-algebra. You're about to play with the professionals. Think of pre-algebra as a runway. You're the airplane and algebra is your sunny vacation destination. Without the runway you're not going anywhere. Seriously, the foundation for all higher mathematics is laid with many of the concepts that we will introduce to you here: negative numbers, absolute value, factors, multiples, decimals, and fractions to name a few. So buckle up and move your seat into the upright position. We're about to take off!

About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.

For free. For everyone. Forever. #YouCanLearnAnything

Subscribe to KhanAcademy’s Pre-Algebra channel:: https://www.youtube.com/channe....l/UCIMlYkATtXOFswVoC
Subscribe to KhanAcademy: https://www.youtube.com/subscr....iption_center?add_us

In this video, I'll show you how to add fractions.

#additionoffractions #AddingDissimilarFractions #DissimilarFractions

you can watch other videos by clicking the link below.

Divisibility rules for 2,5 and 10
https://youtu.be/VRrvDasqIEo

Divisibility rules for 3, 6 and 9
https://youtu.be/Cj4VLhZ7584

Divisibility rules for 4, 8, 11 and 12
https://youtu.be/JiDdtnQxI1U

Divisibility Rule for 7
https://youtu.be/wAreAjCSqow

How to Solve Equations Involving Different Operations
https://youtu.be/jxgPerdbMaM

How to Find the Greatest Common Factor
https://youtu.be/aJD6I71vJcU

HOW TO ADD DECIMAL NUMBERS
https://youtu.be/RGGi7VVRb6I

HOW TO DIVIDE FRACTIONS
https://youtu.be/xi9-42YB8KQ

HOW TO MULTIPLY MIXED NUMBERS
https://youtu.be/lL8Rqmwt0kg

HOW TO ROUND OFF DECIMAL NUMBERS
https://youtu.be/7N9t4Q9takw

HOW TO READ AND WRITE DECIMAL NUMBERS
https://youtu.be/sKFlbr4-Z4o

How to Identify the Place value of decimal numbers
https://youtu.be/Hk_9MEI6V9M

How to Multiply Fractions
https://youtu.be/XcBK4kz5V50

How to change improper fractions to mixed numbers and mixed numbers to improper fractions
https://youtu.be/YiVFKEBkit4


Thank you so much for watching. Please subscribe to our channel. God bless!


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Dans cette vidéo, je te propose de revoir tout le cours sur les opérations de fractions.
L’objet de cette séquence est de te rappeler et de t’expliquer les éléments les plus importants du chapitre :
0:00 Intro
0:37 Addition et soustraction de fractions
10:15 Multiplication
15:54 Division
👍

Site officiel : http://www.maths-et-tiques.fr
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when you had combining or dividing fractions with integers there are two main takeaways that you need to know to apply the operations correctly

***Videos Picked To Watch Next***
⭐️ Fractions - Brian McLogan - https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
⭐️Top 3 Fraction Operations, students make mistake on - https://youtu.be/nN7qv1kY80o
⭐️ How should you add mixed numbers? - https://youtu.be/ULP-RD3MQXk
⭐️ Learn how to add two mixed numbers with unlike denominators - https://youtu.be/oyaYO3UqqS8

***Playlists Picked To Watch Next***
✅ Need to Know Playlist - https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅ Fractions - Brian McLogan - https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅How to Multiply and Divide Fractions
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM

👏SUBSCRIBE to my channel here: https://www.youtube.com/user/m....rbrianmclogan?sub_co

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🗂️ Organized videos by classes here: https://www.youtube.com/user/M....rBrianMcLogan/playli

***More Organized Videos
✅How to Multiply and Divide Fractions
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Add and Subtract Fractions
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Decimals
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Numbers and Percents
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Integer Operations
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Scientific Notation
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅How to Classify Numbers
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Prime Factorization
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM

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#brianmclogan #math #fractions

Subtracting fractions with unlike denominators

Fractions is an important chapter for class 6 maths. Learn what is fraction, Fraction on number line, types of fractions, proper, improper and mixed fractions, like & unlike fractions, equivalent fractions, Conversion of improper fraction into mixed fraction and vice versa , How to make equivalent fractions, Simplification of fractions, comparing and ordering of fractions, Addition and Subtraction of fractions, Solving Word problems on fractions.

Topics covered:
What is fraction, Fraction on Number Line
Types of Fractions - Proper, improper and mixed fractions
Like & Unlike Fractions, equivalent fractions
Conversion of improper fraction into mixed fraction and vice versa
How to make equivalent fractions
Simplification of fractions
Comparing and ordering of fractions
Addition and subtraction of fractions
Solving word problems on fractions
Fraction worksheet for practice
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Delhi Police Maths Class | AWO/TPO/HCM/Constable/Driver Maths Demo 03 | Decimal & Fraction | यकीन 2.0 बैच Delhi Police | Maths by Deepak Sir
Welcome to the Delhi Police Maths Class series! In this video, Deepak Sir will guide you through an essential topic in mathematics: Decimal & Fraction. This lesson is part of the यकीन 2.0 बैच, specifically designed for candidates preparing for the Delhi Police exams like AWO/TPO/HCM/Constable/Driver.

Deepak Sir’s easy-to-understand teaching style ensures that even complex topics like decimals and fractions are simplified for you. If you're preparing for the Delhi Police recruitment exams and aiming to score high in the Maths section, this demo class is a must-watch.

Key Takeaways:
Understanding decimals and fractions with detailed explanations.
Tips and tricks for solving related problems quickly.
Practice questions and problem-solving strategies to boost your exam preparation.
Subscribe to the channel for more demo classes, tips, and exam-related content to stay ahead in your preparation. Join us for the complete learning experience of the यकीन 2.0 बैच!
#DelhiPolice #MathsByDeepakSir #AWO #TPO #HCM #Constable #Driver #DecimalAndFraction #Yakeen2Batch #MathsDemo #DelhiPolicePreparation
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🎯 Méthode simple pour multiplier des fractions
✅ 4 exemples corrigés pas à pas

🔎 Chapitres
00:18 | Exercice 1
01:00 | Exercice 2
01:37 | Exercice 3
02:04 | Exercice 4 : simplifier une fraction ?

🎯 Méthode simple pour multiplier des fractions
✅ 4 exemples corrigés pas à pas

🔎 Chapitres
00:18 | Exercice 1
01:00 | Exercice 2
01:37 | Exercice 3
02:04 | Exercice 4 : simplifier une fraction ?