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✅ In this video,

✔️ Class: Kindergarten
✔️ Subject: Maths
✔️ Topic Name: Addition
✔️ Topics Covered in This Video: Basic math addition for kids, addition for kindergarten, kindergarten maths
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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/geometry/hs-geo-c

SSS, SAS, ASA and AAS postulates for congruent triangles. Showing AAA is only good for similarity and SSA is good for neither

Watch the next lesson: https://www.khanacademy.org/math/geometry/congruent-triangles/cong_triangle/v/two-column-proof-showing-segments-are-perpendicular?utm_source=YT&utm_medium=Desc&utm_campaign=Geometry

Missed the previous lesson?
https://www.khanacademy.org/math/geometry/congruent-triangles/cong_triangle/v/sss-to-show-a-radius-is-perpendicular-to-a-chord-that-it-bisects?utm_source=YT&utm_medium=Desc&utm_campaign=Geometry

Geometry on Khan Academy: We are surrounded by space. And that space contains lots of things. And these things have shapes. In geometry we are concerned with the nature of these shapes, how we define them, and what they teach us about the world at large--from math to architecture to biology to astronomy (and everything in between). Learning geometry is about more than just taking your medicine ("It's good for you!"), it's at the core of everything that exists--including you. Having said all that, some of the specific topics we'll cover include angles, intersecting lines, right triangles, perimeter, area, volume, circles, triangles, quadrilaterals, analytic geometry, and geometric constructions. Wow. That's a lot. To summarize: it's difficult to imagine any area of math that is more widely used than geometry.

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 Khan Academy’s Geometry channel:
https://www.youtube.com/channe....l/UCD3OtKxPRUFw8kzYl
Subscribe to Khan Academy: https://www.youtube.com/subscr....iption_center?add_us

Germs are everywhere. They are often responsible for making people sick. They're so small, you can only see them with a microscope. In Germs for Kids, you and will learn all about the four types of germs that exist in the word: bacteria, viruses, fungi, and protozoa. Let's see what you already know and what you will learn throughout the video!

The first type is bacteria. Bacteria are single-celled organisms that live inside and outside of you body. They can cause ear infections, sore throats, cavities, and more. Not all bacteria are bad, though. In fact, there is lots of good bacteria in some of the food we eat, and our bodies need good germs to help use up the nutrients we ingest. Doctors even use good bacteria to create medicines and vaccines.

Viruses, on the other hand, are all bad. Some examples include chicken pox, the flu, and the measles. Viruses like to invade healthy cells and multiply as the host cell multiplies. Because our bodies have so many cells, there are lots of places for viruses to invade. When we get sick from a virus, we can get what's called a vaccine or immunization to help fight it.

The next type of germ is fungi. A fungus is like a plant and actually consists of many cells rather than just one. Fungi like to live in warm and wet places, such as between a person’s toes. Many fungi don’t cause problems for healthy people. Examples include athlete’s foot, skin infections, and other rashes. Some fungal infections are contagious and can pass from one person to another.

The last type of germ is a protozoa. Like fungi, protozoa live in wet places. And like bacteria and viruses, they also have only one cell. Many live in the water, which is how they spread diseases and infections. Water that is not safe to drink may contain protozoa. These germs can lead to stomach aches, diarrhea, and nausea. The video explains lots of ways to help stop the spread of germs. Keep watching to find out!

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

https://learnbright.org/lessons/science/germs/
https://learnbright.org/lesson....s/science/bacteria-a
https://learnbright.org/lesson....s/science/influenza-
https://learnbright.org/lesson....s/science/immune-sys

What you will learn in this video:
0:00 Introduction to what germs are
0:33 Scenario about viruses
1:05 Why we get sick
1:58 Facts about bacteria
3:17 Facts about viruses
4:31 Facts about fungi
5:23 Facts about protozoa
6:14 Ways to stay healthy
8:10 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.

Find and Follow Us Online:
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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

#ASL
#Germs
#bacteria #Virus

This chemistry video tutorial provides a basic introduction into valence electrons and the periodic table. It explains how to determine the number of valence electrons and core electrons in an element by drawing the bohr model of an atom, by writing the electron configuration of the element and by using the periodic table.

Speed of Light, Frequency, Wavelength:
https://www.youtube.com/watch?v=LgYMxH1LCdo

Photon Energy:
https://www.youtube.com/watch?v=PYNSopwd1l4

The Photoelectric Effect:
https://www.youtube.com/watch?v=-LECEvusk8E

De Broglie Wavelength:
https://www.youtube.com/watch?v=cYyFPFU6s_A

The Bohr Model of Hydrogen:
https://www.youtube.com/watch?v=mXxsT1ut35Q

Heisenberg's Uncertainty Principle:
https://www.youtube.com/watch?v=BNYz5EKXVeI

________________________________
Intro to Quantum Numbers:
https://www.youtube.com/watch?v=eRIN9CPDrpo

Orbitals & Atomic Energy Levels:
https://www.youtube.com/watch?v=4sLXUr2HWIs

Maximum Number of Electrons:
https://www.youtube.com/watch?v=UNE-7AuiMGs

Intro to Electron Configuration:
https://www.youtube.com/watch?v=NIwcDnFjj98

Electron Configuration Exceptions:
https://www.youtube.com/watch?v=Ur2PuzJ7KWs

Noble Gas Notation:
https://www.youtube.com/watch?v=6MAKMnZdfbs

Electron Configuration of Ions:
https://www.youtube.com/watch?v=nlZa8lN_-Ds

_______________________________
Orbital Diagrams:
https://www.youtube.com/watch?v=6dRdMy9tgzE

Paired & Unpaired Electrons:
https://www.youtube.com/watch?v=xwWJf48yfNs

Aufbau's Principle & Hund's Rule:
https://www.youtube.com/watch?v=C6afrc1QS6Y

Paramagnetic & Diamagnetic Elements:
https://www.youtube.com/watch?v=SO983iq9GaI

Valence Electrons & Periodic Table:
https://www.youtube.com/watch?v=FPk2ziB9iX0

Effective Nuclear Charge:
https://www.youtube.com/watch?v=JDsMR1bHGO4

_________________________________
Slater's Rule:
https://www.youtube.com/watch?v=TaYUOiEe6OA

How To Identify The Element:
https://www.youtube.com/watch?v=4qwJIJUaIeQ

Quantum Numbers - Mega Review:
https://www.youtube.com/watch?v=lPptuKlCM6k

Quantum Numbers - Practice Test:
https://www.youtube.com/watch?v=E-nOH18dF-c

Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

This algebra video tutorial explains how to multiply rational expressions by factoring and canceling. It explains how to factor the greatest common factor, factoring trinomials, factoring difference of squares, factoring sums and differences of cubes, and factor by grouping. This video contains plenty of examples and practice problems on simplifying rational expressions.

Fundamental Theorem of Algebra:
https://www.youtube.com/watch?v=cAfRgqEOURw

Rational Expressions - Basic Intro:
https://www.youtube.com/watch?v=0Gq3uw2p6fA

Simplifying Rational Expressions:
https://www.youtube.com/watch?v=uVpsz-xpnPo

Multiplying Rational Expressions:
https://www.youtube.com/watch?v=RROSgr4oXjU

Dividing Rational Expressions:
https://www.youtube.com/watch?v=rMVOdIDNjpA

______________________________________
Adding & Subtracting Rational Expressions:
https://www.youtube.com/watch?v=WWwG2uh4OUE

Rational Expressions - Unlike Denominators:
https://www.youtube.com/watch?v=1KGVwaUhR-s

Simplifying Complex Rational Expressions:
https://www.youtube.com/watch?v=ifDEetTq8bM

How To Solve Rational Equations:
https://www.youtube.com/watch?v=1fR_9ke5-n8

Rational Equations - Extraneous Solutions:
https://www.youtube.com/watch?v=PvMYq9JD724

_____________________________________
Horizontal and Slant Asymptotes:
https://www.youtube.com/watch?v=kvhpu1TkSjI

Finding Rational Functions Given 2 Points:
https://www.youtube.com/watch?v=ODs3t1vX1GY

Rational Functions - X and Y Intercepts:
https://www.youtube.com/watch?v=ebpEDR4-Q3Y

Graphing Advanced Rational Functions:
https://www.youtube.com/watch?v=GxynsEIvjRA

Rational Inequalities:
https://www.youtube.com/watch?v=gfnVHwhEe6U

________________________________________
Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

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Lesson Title: Divisibility Rules
File: Interactive Math PowerPoint presentation
Grade: 6

Dividing by 1:
All numbers are divisible by 1.

Divisible by 2:
All even numbers are divisible by 2.
Even numbers are numbers that end with either 2, 4, 6, 8, or 0.

Divisible by 3:
Add up the digits of the number.
If that number is divisible by 3, then the original number is.
If your sum is still a big number, continue to add the digits.

Dividing by 4:
If the last 2 digits together are divisible by 4.

Dividing by 5:
If the number ends in 5 or 0.

Dividing by 6:
If the number is divisible by 2 and 3.

Divisible by 7:
There is no specific rule. It can be done through manual division.

Divisible by 8:
If the last three digits are divisible by 8.
If the number is divisible by 2, then by 2 again, and then by 2 again.

Divisible by 9;
The same as dividing by 3.
Add up all the digits.
If that number is divisible by 9 then it is divisible by 9.

Dividing by 10:
If the number ends with a 0.

Artificial Intelligence (AI) is increasingly becoming one of the disruptive factors in the educational business. AI in the education market was predicted to rise to $10.38 billion by 2026 (by 45.12% annually). AI EdTech startups are attracting millions of dollars in funding and millions of users. Now is the time to discuss the transformations brought by AI in education.

For More Information, Visit: https://www.analyticsinsight.net/

#AIinEducation #ArtificialIntelligence #AI #Edtech #AIEdtech #AIEdtechStartups #EdtechStartups #ArtificialIntelligenceinEducation #DisruptiveFactors #EducationalBusiness #AIVideo #AnalyticsInsightVideo #AINews #AnalyticsInsight #AnalyticsInsightMagazine

4th Grade - English, Language Arts, & Reading
Texas Tech University
TTU K-12

Join Caroline and Sophie as they celebrate National Reading Month and their love of reading. In this Circle Time, our hosts share their three favorite read-aloud episodes which include Old Friends New Friends, A Helping Hand, and Flower Friends—all written by Cynthia Platt. Tune in and listen to these three sweet stories about friendship and then continue the reading journey by finding these stories in the Khan Kids app.

Learn more about Khan Academy Kids, our free educational app for children ages 2-8, at http://www.khankids.org.

Available on Apple, Google Play, and Amazon app stores:

http://khan.co/KhanKids-YT-Apple
http://khan.co/KhanKids-YT-Google
http://khan.co/KhanKids-YT-Amazon

Remember to subscribe to Circle Time to be reminded of our new shows!

You can also access all of our Circle Time videos on our Circle Time Playlist, here: http://khan.co/KhanKids-CircleTimePlaylist.

Questions? Reach our team at khankids@khanacademy.org.

What is a fact? What is an opinion? And what is the difference between the two? In Fact and Opinion for Kids, you and your student(s) will learn how to tell the difference between a statement of fact and one that is simply a person's opinion.

This video starts out with a great example that demonstrates opinions. Andrew loves pizza, his mom loves ice cream, and his dad loves apples. None of these foods are the best food in the world to everyone, so each person's favorite food choice is their opinion. Facts are statements that can be proven. The sun is yellow. The sky is blue. These are facts that people can prove quite easily. Summer is the best time of year. Soccer is the most fun sport to play. These statements cannot be proven. They are opinions because people prefer different things. Some people may believe summer to be the best time of year. Others, though, might prefer autumn or winter weather even more.

Some opinions can be supported by facts. While they are still opinions, they can be considered widely accepted because of the facts that support them. There are two reasons to know the difference between facts and opinions. One reason is that listening to others' opinions help you better understand them and know them better. The other reason is that knowing the facts about something helps you make important decisions.

We hope you and your student(s) enjoyed learning how to differentiate between a fact and an opinion! If you want even more practice, 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/fac
https://learnbright.org/lesson....s/language-arts/supp
https://learnbright.org/lesson....s/reading/evaluating
https://learnbright.org/lesson....s/language-arts/opin

What you will learn in this video:
0:00 Introduction to facts and opinions and example story
1:26 Tell the difference between facts and opinions
2:38 What is an opinion? What is a fact?
3:17 Listen and identify the facts and opinions
4:44 Opinions supported with facts
5:14 Confusing facts with opinions
6:15 Two reasons to know the difference between facts and opinions

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

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 and sign up for a free account, and you will 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 Reading lesson plans: https://learnbright.org/lessons/?filter_subject=reading

#ASL
#FactAndOpinionForKids
#FactsAndOpinions

It's Kids Academy, and welcome back to our channel! In this educational video for kids, we will learn letters Y and Z. Your child can easily memorize letters I to L using our examples. It's ideal for preschool and kindergarten. Stay tuned!

Subscribe to our channel: https://goo.gl/iG2Bdr

#kidsacademy #LearnWithKidsAcademy

Connect with us on :
App Store: https://apps.apple.com/app/apple-store/id543851593
Google Play: https://play.google.com/store/....apps/details?id=air.

Our website: http://www.kidsacademy.mobi
Instagram: https://www.instagram.com/kidsacademyco
Facebook: https://www.facebook.com/KidsAcademyCompany

Videoen tar for seg grunnleggende ferdigheter i GeoGebra.

This session focuses on teaching about AI, evaluating and utilizing AI educational tools, and leveraging AI for student assessment. With a rich blend of theory, practical examples, and resources, it aims to empower educators to navigate the AI landscape and enhance student learning experiences.

Teacher Resources: http://bit.ly/PromptLLM

Presented by: Code.org, ETS, ISTE, Khan Academy

Chapters
0:00 - Introduction
0:35 - Teaching about AI
7:34 - Teaching with AI
14:40 - AI-assisted Assessment
23:59 - Professional Learning
26:12 - Final thoughts
28:20 - Conclusion

Register for Al 101 for Teachers today!
https://code.org/ail01

Stay in touch with us on social media:
• Twitter: https://twitter.com/codeorg
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• Medium: https://medium.com/@codeorg

Help make our work possible with a donation at http://code.org/donate!

The value of b^2-4ac gives us some immediate information about how the graph of our Quadratic Function will look. This video discusses the three scenarios one will run into when trying to graph a Quadratic Function.

Some images made using Geogebra.

#b^2-4ac
#Quadratics
#Discriminant
#JoeCMath
#Algebra

0:00 Introduction
0:23 Three scenarios for b^2-4ac
0:40 b^2-4ac is positive
1:44 b^2-4ac is zero
2:40 b^2-4ac is negative
3:32 Summary
4:35 Subscribe if the Krusty Krab is better than the Chum Bucket

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Discover hundreds of never-before-seen resources! Create your free account at https://my.happylearning.tv/ and start learning in the most entertaining way.

What are you waiting for? Puuuurrrr Let's get feline 🐈
💭 Can you tell me what cats tongues are full of?
👇Answer in the comments bellow!
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Recommended video: Why do Camels and Dromedaries have humps?
https://youtu.be/JPMnemG5en0
-------------
Fun facts about animals

The secret behind a cat’s tongue

Cats are very special mammal animals, and until not long ago, they had a secret in their tongue which we have finally discovered. They are very sleepy animals, they sleep 14 hours a day, but they are also very clean, since when they are awake they dedicate a long time to cleaning their bodies with their own tongues.

But we couldn’t understand how they could clean themselves perfectly by just licking. Some researchers have found out that cats tongues are covered in many tiny thorns called buds. These thorns have a hollow cavity, which cats use to fill with saliva and use it, as if it was a sponge with water and soap, to clean all of their bodies. That is, by licking themselves! Cats are very clean, and beautiful!

If you want to learn a lot more, take advantage of time and get excellent grades in a very fun way, subscribe to our TV Channel, Happy Learning TV… We teach by entertaining.


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📍📍歡迎收看《English Speaking系列》📍📍
Talking about different festivals
👉https://youtu.be/7XWE_QB0qEk
Introduce your school
👉https://www.youtube.com/watch?v=DPfvjdEI7Dw
Back to school
👉https://www.youtube.com/watch?v=NSv5QyPmhpw
Good manners_actions
👉https://youtu.be/_Swu0JtZke0
Good manners
👉https://www.youtube.com/watch?v=HGME2UCt6-M&t=29s
Talking about daily routines
👉https://youtu.be/Np8mJ1uw8c8

📍📍歡迎收看《Grammar系列》📍📍
Lesson4_common mistakes
👉https://youtu.be/A7Yz6eEcYPs
Lesson3_irregular verbs_part2
👉https://youtu.be/vE6AnyrYDZQ
Lesson2_irregular verbs_part 1
👉https://youtu.be/C_p_r053MeQ
Lesson1_Opposite words
👉https://youtu.be/ftz3u46E0Zo

📍📍歡迎收看《Cooking系列》📍📍
Make fresh juice
👉https://www.youtube.com/watch?v=VFOo2RW_qoI

📍📍歡迎收看《Shorts系列》📍📍
Funny jokes 5
👉https://youtube.com/shorts/7Rq0v77lq3Q
Funny jokes 3
👉https://youtube.com/shorts/VJe4DCE9lLs
Funny joke 2
👉https://youtube.com/shorts/2ouEf37QtdQ
Funny joke 1
👉https://youtube.com/shorts/OJ2-YEfl2uw
Tongue twister_birdie vs turdie vs pie
👉https://youtube.com/shorts/yvOv4EVm6Xc
Tongue twister_scream vs ice cream
👉https://youtube.com/shorts/KBi79AOOPow
Tongue twister_fuzzy vs wuzzy
👉https://youtube.com/shorts/pwGPW_cWdxc
Tongue twister_whether vs weather
👉https://youtube.com/shorts/_3yjqCC4ASA
Read with me_Irregular verbs Part A
👉https://youtube.com/shorts/OfA0FlrxVy8
Read with me_Irregular verbs Part B
👉https://youtube.com/shorts/GV9iXpKMUAk

📍📍歡迎收看《Fun Games系列》📍📍
Make a guess
👉https://youtu.be/J0E2LF9_chU
Quiz Time
👉https://youtu.be/M4JrGzedjH0
Quiz Time
👉https://youtu.be/k7cTb77sh1Q
Quiz Time
👉https://www.youtube.com/watch?v=QGwhG4Mk_Ow&t=5s
Quiz Time
👉https://www.youtube.com/watch?v=xDUJPNRh3mA


📍📍歡迎收看《Basic conversation系列》📍📍
Basic conversation Lesson 9_How can I help you
👉https://youtu.be/6Nx1dXLeQMU
Basic conversation Lesson 8_Talking about your best friend
👉https://youtu.be/NknxeVxhP7A
Basic conversation Fun Lesson_Different languages
👉https://youtu.be/mCJPRD7pahw
Basic conversation Lesson 7_Apply for a library card and borrow books
👉https://www.youtube.com/watch?v=5XCmL9clkQY
Basic conversation Lesson 6_Ordering food
👉https://youtu.be/xaJKiHn6vuc
Basic conversation Lesson 5_Visiting friends
👉https://youtu.be/5TkeC8iirVA
Basic conversation Lesson 4_Making phone calls
👉https://youtu.be/B2CUxLSK5CU
Basic conversation Lesson 3_Types of weather
👉https://youtu.be/ivyo-t50qnw
Basic conversation Lesson 2_Days in a week
👉https://youtu.be/fAtrVak5qLo
Basic conversation Lesson 1_Greetings
👉https://youtu.be/hl_foOF6EjY

📍📍歡迎收看其他《Vocabulary詞匯系列》📍📍
Animals on land_陸地動物
👉https://youtu.be/XxZXjGkJkCQ
Animals in the sea_海洋動物
👉https://youtu.be/gN7GsS6cCeg
Parts of the body_身體部份名稱
👉https://youtu.be/GviCG650sng
Theme Park facilities_主題公園設施
👉https://youtu.be/RiP4etv1ANs
Famous Landmarks_國家名勝地標名稱
👉https://youtu.be/-_rRauEiDic
Colour_顏色
👉Part 2https://youtu.be/78xUTO1My_E
Furniture in the living room_客廳內傢俱名稱
👉https://www.youtube.com/watch?v=smN7hHwHL1g
2D shapes_平面形狀的名稱
👉https://www.youtube.com/watch?v=P4wT5wmqIRY
Jobs_職業名稱
👉https://www.youtube.com/watch?v=NYDTE...
Hairstyle_不同髮型的英文名稱
👉https://www.youtube.com/watch?v=PU_BB2Kvj_w
Solar System_太陽系
👉https://www.youtube.com/watch?v=Qwwczge-_ks
Tableware_餐具名稱
👉https://www.youtube.com/watch?v=rm4FNlRQZxE
Hats_帽子的名稱
👉https://www.youtube.com/watch?v=Pl3g8JgXeGc
Egg_蛋的不同煮法名稱
👉https://www.youtube.com/watch?v=alwVK7zoplc
National Flags_國家及國旗
👉https://youtu.be/tBwHd6XHfE0
The 12 Chinese Zodiac_12生肖
👉https://youtu.be/ii8djvnF-pk
Fruit_水果名稱
👉https://youtu.be/ozwI9sk-bo4
Stationery_文具名稱
👉https://youtu.be/jsjwHTaWfkg
Colour_顏色 Part 1
👉https://youtu.be/AiiGKUEuWx4

📍📍歡迎收看《停課不停學系列》 📍📍
Number 1-10
👉https://youtu.be/wVn_0fY5i1o
Fruit
👉https://youtu.be/C3jy63nGhgA
Transportation in HK
👉https://youtu.be/5qQX0ymwwqo
Vegetables
👉https://m.youtube.com/watch?v=iu1OnlmqRI4
Sports
👉https://youtu.be/eF_Dv6owlM8
Relaxing activities
👉https://www.youtube.com/watch?v=ROv7OlyXe0A

📍📍歡迎收看《Writing a composition系列》 📍📍
👉School Picnic Day
https://youtu.be/GNXyS84JrQo
At the beach
👉https://www.youtube.com/watch?v=WcERiNMpb9s

📍📍歡迎收看《小一叩門面試》系列 📍📍
👉School Interview_Part 1:Talking about yourself
https://www.youtube.com/watch?v=wWTwr2o4_uo
👉小一叩門：不能不看題目背後的真正意義
https://m.youtube.com/watch?v=msqXn02v8tw
👉小一叩門：面試陷阱
https://m.youtube.com/watch?v=OrTx4B_cnkw

A basketball and a 5kg medicine ball are dropped simultaneously. Which one hits the ground first? It seems obvious that the heavy one should accelerate at a greater rate and therefore land first because the force pulling it down is greater. But this is forgetting inertia - the tendency of mass to resist changes in motion. Therefore, although the force on the medicine ball is greater, it takes this larger force to accelerate the ball at the same rate as the basketball.

What causes the phases of the moon? The common incorrect answer is the shadow of the Earth. The phases of the moon are actually just a result of our perception of the moon's half-illuminated surface. When the moon does pass through Earth's shadow the result is a lunar eclipse. This can be spectacular as the moon turns a deep shade of red.

Images courtesy of NASAimages.org and Geoff Wyatt, Senior Astronomy Educator Powerhouse Museum