An atom is mostly empty space, but empty space is mostly not empty. The reason it looks empty is because electrons and photons don't interact with the stuff that is there, quark and gluon field fluctuations.
It actually takes energy to clear out space and make a true 'empty' vacuum. This seems incredibly counter-intuitive but we can make an analogy to a permanent magnet. When at low energies, like at room temperature, there is a magnetic field around the magnet due to the alignment of all the magnetic moments of the atoms. But if you add some energy to it by heating it, the particles gain thermal energy, which above the Curie temperature makes their magnetic moments randomly oriented and hence destroying the magnetic field. So in this case energy is needed to clear out the field, just as in the quantum vacuum.

Special thanks to Professor Derek Leinweber, find out more about his research here: http://bit.ly/ZZTKFP

Many videos on YouTube show water freezing almost instantaneously. This video shows you how to replicate the experiment and it explains how the phenomenon works. Molecular illustrations are courtesy of:
PhET Interactive Simulations
University of Colorado
http://phet.colorado.edu.

Check out some of our favorite shop products here: https://kgs.link/shop Our shop is not only our most important source of income, but our passion project where we create sciencey products with of lot of love and detail.

Sources & further reading: https://sites.google.com/view/....sources-interstellar

Could aliens destroy us from light years away? Another day at Kurzgesagt Labs, where we answer the most important questions with science.
Today: how might civilizations wage war across light years? What kind of devastating weapons could they use and what would they look like?

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Is there a border we will never cross? Are there places we will never be able to reach, no matter what? It turns out there are. Far, far more than you might have thought…

Check out Ethan Siegels Astronomy blog, "starts with a bang": http://onforb.es/1THyMGT

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How Far Can We Go? Limits of Humanity.

Help us caption & translate this video!

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Visit https://www.abcmouse.com/learn/youtube to learn more about our award-winning online learning program for children 2-8!

🍀✨ ABCmouse is on a St. Patrick’s Day adventure to find the perfect shamrock! But when he picks a four-leaf clover instead of a real shamrock, his friends help him on a fun-filled scavenger hunt. Will they find the right one in time? And is that a real leprechaun they just saw?! 🌈🎒

👉 Discover more fun learning songs and educational videos by subscribing to our YouTube channel at https://YouTube.com/ABCmouse.

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Pre-order our book YOU ARE AN ARTIST (which includes new assignments!) here: http://bit.ly/2kplj2h

This week we meet with Jesse Sugarmann, whose artwork considers how the automotive industry shapes the way we live and construct our identities. His assignment asks you to think about the way car consumerism, and the aesthetic choices behind it, has shaped you and your family. Let's talk cars.

INSTRUCTIONS - Vehicular Palette
1. Ask members of your family what kind of cars they’ve owned and when. Make a list.

2. Select a timeframe for your data

3. Choose an element of the car you would like to focus on

4. Take these elements and create a data visualization system

5. Share using #theartassignment

6. Fame and glory (Your work might be in a future episode)

Link for the full steps: https://youtu.be/h31PemGX2zA

Learn more about Jesse's work: https://vimeo.com/user7569805

Find out more about The Art Assignment and how to submit your response: http://theartassignment.com/

Many students who struggle with word problems need a strategy to organize their thoughts and approach the problem. Dr. Powell provides suggestions for what makes a quality word problem attack strategy. She also tackles a few word problems using her favorite word attack strategy, UPS Check.

This video is part of Project STAIR, an online resource for teachers and parents who are helping their students master the fundamentals of algebra readiness skills.

If you have a question that you would like Project STAIR to demonstrate, or you would like to share your thoughts, please provide your feedback and input in our brief survey here:
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…and how did it evolve in the first place?
Tweet ⇒ http://bit.ly/OKTBSsleep Share on FB ⇒ http://bit.ly/OKTBSsleepFB
↓ More info and sources below ↓

Why do we sleep? We spend a third of our lives in slumber, but science has yet to determine exactly why we have do it. Here’s a look at how sleep works, why we’re not getting enough sleep, what happens if you DON’T sleep, and an idea about where sleep came from in the first place.

Follow me to The Good Stuff’s sleep playlist: https://youtu.be/RHCcM7LyZdc?l....ist=PLsRLUurFnvvUCys

Also check out BrainCraft:
https://youtu.be/yv-XNKK9laE
https://youtu.be/ZPpvS9wDOcA

For more, read:

“Dreamland: Adventures in the Strange Science of Sleep” by David K. Randall http://amzn.to/1MB38dt

"The Universal Pastime: Sleep and Rest Explained" by Dr Richard Horner http://amzn.com/B00NT9O60O

Cool research on melatonin in sea worm larvae: http://www.nytimes.com/2014/10..../02/science/the-evol

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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It’s Okay To Be Smart is written and hosted by Joe Hanson, Ph.D.
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Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen Inc.
Kate Eads - Producer
Andrew Matthews - Editing/Motion Graphics/Animation
Arts & Labor - Motion Graphics
Katie Graham - Camera
John Knudsen - Gaffer

Theme music: “Ouroboros” by Kevin MacLeod

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Stock images from Shutterstock, stock footage from Videoblocks (unless otherwise noted)

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Here’s a thought: What IS a thought? I know it involves my brain, and my brain is made of neurons. And my brain’s neurons are listening to other neurons all over my body. But how do those neurons actually work? Maybe you’ve heard that it involves electricity, but does that mean you’ve got little zaps and lightning bolts running through your veins like Pikachu? Don’t worry, I’m here to set you straight on what a neuron is, what an action potential is, and how fast your nervous system really communicates.

Neuron spiker box from Backyard Brains (they didn’t sponsor this video in any way, but their kits are very educational!) https://backyardbrains.com/

References: https://sites.google.com/view/....galvani-nerve-brain/

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It sounds like such an incredible fact. “Our own cells are outnumbered by our microbes 10 to 1!” I don’t remember where I first heard it. But I read it in science papers and articles by journalists, so I believed it without question. I even made one of my first videos based on this fact. Problem is, this fact is not true. So how did it remain firmly planted in our common knowledge for almost four decades without any scientific scrutiny? And how can you prepare yourself to not be fooled by other scientific urban legends? I look at a few of the most famous incorrect factoids in science, and give a few suggestions for how to make our common knowledge more correct.

References: https://sites.google.com/view/....7-scientific-urban-l

Please do not watch this old video, it is wrong and my hair is awful: https://www.youtube.com/watch?v=4BZME8H7-KU


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Can we really clean our way out of this problem?
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There’s been a lot of talk on YouTube lately about ocean plastic pollution and #TeamSeas. But there hasn’t been enough talk about the **ridiculously unthinkable scale of the ocean plastic pollution problem** or how it intersects with other environmental issues like climate change. And here’s a big spoiler alert: Nearly all environmental scientists agree that ocean plastic pollution isn’t a problem we can clean our way out of. So what CAN we do? That’s what this video is about.

Detailed references and annotations: https://sites.google.com/view/....besmart-plasticpollu

We’d like to thank the following researchers for helpful interviews and background materials for this episode:

Winnie Lau - Pew Charitable Trusts
Dr. Max Liboiron - Civic Laboratory for Environmental Action Research (CLEAR)
Dr. Miriam Goldstein

0:00 Intro
1:21 History of plastic
2:59 How much plastic are we making?
4:28 Plastic is petroleum
5:29 How much plastic is in the ocean?
7:38 How plastic gets to the ocean
9:09 Can we clean our way out of this?
10:30 The ACTUAL solutions
13:09 Final thoughts


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I min lille serie af videoer med gode og nemme lege til matematiktimerne, kommer her 3 tips til lege med terninger.
De er lige til at gå til, og det eneste du skal bruge er to terninger, ternet papir og en tush.
Husk også at se mine videoer "Leg med mønter" og Leg med Centicubes" lige her:
https://www.youtube.com/watch?v=mIp0qYqApV8&t=
https://www.youtube.com/watch?v=fpqomhdlHoU&t=

Der er mange flere værksteder på min hjemmeside, som du kan tjekke ud. Og følg mig gerne, så bliver jeg glad.
Kh Anette K
https://facebook.com/anettekmatematik/
https://instagram.com/anettekmatematik/
https://www.youtube.com/channe....l/UCR8PqEuBE7OlORn2y
https://anettekmatematik.com/
#legoglæring #matematikspil #lærmatematik

What is the oldest language in the world? This seems to be a simple and straightforward question. But it is not that simple at all. And before answering, it is necessary to know: what do you mean when you say "the oldest language"?

Link to my Patreon account: https://www.patreon.com/julingo

Music used:
The quiet one by Taomito
After rain: Sunshine by Taomito
Unchartered by Taomito

Video used:
Khoisan click language by xurxo mariño
https://www.youtube.com/watch?v=W6WO5XabD-s

#languages #linguistics #history

🤩 Ready to learn about the head, hair, ears, eyes, nose, mouth, shoulders, and other body parts? ✔️ Help your kids learn the basic human body parts with this fun animated sing-along song! It makes sense, after all, as they've got arms and legs, too! ✏️ With this educational nursery rhyme, you can help your baby learn basic human body parts, complete with family friendly pictures and sing-along lyrics. 💡

🦁 Lucas and friends make learning easy and fun for children of all ages. 📚 It's a great way for babies, toddlers, preschoolers, and kindergarteners to learn the most common human body parts – eyes 👀, ears 👂, stomach, legs 🦵, and more! Help them learn while having fun, all in ultra HD 4k for the best audio and video quality possible. 🚀 It’s time to educate! 🎓

⦿ Body Parts Song Lyrics:

This is my head, and I love my head
This is my waist, and I love my waist
This is my hands, and I love my hands
This is my legs, and I love my legs

Hey Lucas, can you tell me what this is?
Yes, these are my hands.

Dooby dooby doob doob doob
Dooby dooby doob doob doob
Dooby dooby doob doob doob
Dooby dooby doob doob doob

I nod and nod with my head
I swirl and dance with my waist
I clap and hold with my hands
I run and walk with my legs

"Nod"
"Swirl"
"Clap"
"Run"

Dooby dooby doob doob doob
Dooby dooby doob doob doob
Dooby dooby doob doob doob
Dooby dooby doob doob doob

This is my ears, and I love my ears
This is my eyes, and I love my eyes
This is my nose, and I love my nose
This is my mouth, and I love my mouth

Hey Brody, can you tell me what this is?
Yes, it is my nose

Dooby dooby doob doob doob
Dooby dooby doob doob doob
Dooby dooby doob doob doob
Dooby dooby doob doob doob

I hear and listen with my ears
I see and blink with my eyes
I smell and breathe with my nose
I sing and eat with my mouth

"Listen"
"See"
"Smell"
"Sing"

Dooby dooby doob doob doob
Dooby dooby doob doob doob
Dooby dooby doob doob doob
Dooby dooby doob doob doob

⭐ If our video entertains your child and makes them happy, please hit the LIKE button. SHARE it with your friends and family members so that more and more kids can sing and have fun. 👍 SUBSCRIBE to our channel to watch our other nursery rhymes, kids songs, and educational videos for children and parents. 🔔 And make sure you turn on the bell icon to get notified as soon as our new videos come up. 🔥

🛍️ Official Lucas & Friends Store Now Open - https://shop.rvappstudios.com

📢 Checkout Lucas & Friends Educational Children's Books: https://www.amazon.com/Lucas-F....riends-by-RV-AppStud

🎯 Try our FREE Educational Apps for Babies & Toddlers:
🟡 Google Play: https://play.google.com/store/....apps/dev?id=74300059
🟣 iOS: https://apps.apple.com/develop....er/rv-appstudios-llc
🟢 RV AppStudios: https://www.rvappstudios.com/kidsapp.html

🌟 More fun nursery rhymes and kids songs by RV AppStudios:
✋ Body Parts for Kids - https://youtu.be/G-7AMnZLOCM
✏️ Antonyms Words For Toddlers - https://youtu.be/ABrZ3IRoUBE
🐱 Animal Sounds for Kids - https://youtu.be/uiI50n3qVgc
🗒️ Learn Months Of The Year - https://youtu.be/5N3w0zxEwVs

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#BodyParts #Education #KidsSong