This video is sponsored by Brilliant. You can get started for free, or the first 200 people to sign up via https://brilliant.org/veritasium get 20% off a yearly subscription. Check out Adam Savage's video: https://youtu.be/h_zytOcMwys

A massive thanks to Adam Savage and the whole Tested Crew – especially Kristen Lomasney, Ryan Kiser, and Joey Fameli. Thank you so much for coming out to the desert with us, and for inviting us to your cave! Check out the video we made with them on their channel – https://youtu.be/h_zytOcMwys

Another huge thanks to iFly Ontario for letting us shoot in your amazing windtunnel. Special thanks to Diana Rios, Treasa Telle, Michelle Brumley for having us and Anthony Jones, Torrell Henderson and Nate Roth for being great instructors. iFly run STEM education trips, where you can experience terminal velocity first hand – https://www.iflyworld.com/prog....rams/stem-field-trip

Thanks to Inland Empire Film Services and the San Bernardino County Film Office for portions of the video shot in the County of San Bernardino.

The raindrop video is from Alistair McClymont’s gorgeous artwork “Raindrop” – ​​https://alistairmcclymont.com/artwork/raindrop/

Video of the raindrop breaking apart is from the coolest paper i’ve read in a while – Villermaux, E., & Bossa, B. (2009). Single-drop fragmentation determines size distribution of raindrops. Nature physics, 5(9), 697-702. – https://ve42.co/Villermaux



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References:
Altair. (2019). Digital Debunking: Could a Penny Dropped Off the Top of the Empire State Building Actually Kill You? - https://ve42.co/Altair2019


Braeunig, R.A. Atmosphere Properties. - https://ve42.co/AtmosProp


The Guardian. (2014). Brutal winter weather brings new challenge: ice falling from skyscrapers - https://ve42.co/WTCicicle


NASA. (2018). The Apollo 15 Hammer-Feather Drop - https://ve42.co/NASAmoondrop


Red Bull Stratos - https://ve42.co/RBStratos


Quealy, K., Sanger-KatzIn, M. (2015). In Other Countries, You’re as Likely to Be Killed by a Falling Object as by a Gun. New York Times. - https://ve42.co/NYTFallingObject


National Safety Council. (2022). Struck by Objects. - https://ve42.co/NSCStruck


Williams, A. (2019). What are your chances of being killed by hail in the US? - https://ve42.co/Williams2019


NewScientist. (2021). Can bullets fired upwards cause injuries when they return to earth? - https://ve42.co/CelebratoryGunFire

Chambers, J. (2020). Meet the Flechette – the Deadliest Weapon of World War I? - https://ve42.co/Flechette

Wikipedia. Lazy Dog (bomb). - https://ve42.co/LazyDog

Gläser, N., Kneubuehl, B. P., Zuber, S., Axmann, S., Ketterer, T., Thali, M. J., & Bolliger, S. A. (2011). Biomechanical examination of blunt trauma due to baseball bat blows to the head. Journal of Forensic Biomechanics, 2 - https://ve42.co/Glaser2011

Yoganandan, N., Pintar, F. A., SANCES JR, A. N. T. H. O. N. Y., Walsh, P. R., Ewing, C. L., Thomas, D. J., & Snyder, R. G. (1995). Biomechanics of skull fracture. Journal of neurotrauma, 12(4), 659-668.

New York Times. (2014). Falling Tape Measure Kills Man at Jersey City Construction Site - The New York Times - https://ve42.co/NYTTapeMeasure

IMDb. (2006). "MythBusters" Bullets Fired Up (TV Episode). - https://ve42.co/MBgunfire

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This video is a continuation of my video on Comparing Mixed Numbers and gives you the opportunity to look at 4 examples that you can pause and work through yourself prior to me walking through step by step how to solve them.


Improved math is a channel created to provide additional instruction on essential math concepts. I’m passionate about math and I know first-hand how important math concepts are in the real world.

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Paleozoic EraPaleozoic era was 544 to 245 million years ago
Paleozoic means “ ancient life” and is part of the phanerozoic eon along with the cenozoic, and mesozoic eras
Let’s hit some highlights of this era
Early during the Paleozoic era trilobites, echinoderms, and other marine invertebrates such as coral dominated the oceans.
Jawless fish also lived during this era
Evently sharks and other bony fish appear
However, as time passed life did not remain in the sea.
Land plants began to appear such as ferns and some trees later in this era
Life was also crawling out of the ocean
The first vertebrates appeared Among these vertebrates was a tetrapod which was a vertebrate that could live on land
Other vertebrates would appear including snakes,crocodiles,
Reptiles and insects scatter throughout the world and amphibians appear
The supercontinent Rodinia brook apart early in this era, but by the end of the era the supercontinent Pangea was formed.

Welcome to our sing-along nursery rhyme video for kids! 🤩 In this video, we'll be singing Miss Polly Had a Dolly poem, a fun and educational song that's perfect for teaching children new words and new rhymes (and perfect for just being entertaining!). 👪 Grab the kids and join us for a fun time!

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Miss Polly had a dolly who was sick, sick, sick
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The doctor came with his bag and his hat
And he knocked at the door with a rat-a-tat-tat

He looked at the dolly and he shook his head
And he said, "Miss Polly, put her straight to bed"
He wrote on a paper for a pill, pill, pill
I'll be back in the morning if the baby's still ill

Miss Polly had a dolly who was sick, sick, sick
And she called for the doctor to come quick, quick, quick
The doctor came with his bag and his hat
And he knocked at the door with a rat-a-tat-tat

He looked at the dolly and he shook his head
And he said, "Miss Polly, put her straight to bed"
He wrote on a paper for a pill, pill, pill
I'll be back in the morning if the baby's still ill

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Oficios en español. "¿De qué trabajas?", también revisamos las proposiciones, con diálogos divertidos. Aprende a hablar sobre tu trabajo en español. "A qué te dedicas?" "Soy mi propio jefe".

This precalculus video tutorial explains how to graph polynomial functions by identifying the end behavior of the function as well as the multiplicity of each zero or x intercept.

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A war has been raging for billions of years, killing trillions every single day, while we don’t even notice. This war involves the single deadliest being on our planet: The Bacteriophage.

Created with scientific advice and editing by James Gurney.


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The Deadliest Being on Planet Earth – The Bacteriophage

🔴 LIVE I All animal and dinosaur curiosities I Educational videos for kids 24h animal and dinosaur curiosities for kids to learn with fun and educational videos Welcome to a new session full of fascinating curiosities in the animal and dinosaur world on Happy Learning channel! 🌟🦕🐾 In this exciting live stream, we'll dive into the amazing animal kingdom to discover curious, surprising and sometimes hilarious facts about various species. From fascinating sea creatures to exotic land animals, we'll explore their unique behaviors, surprising adaptations and other interesting aspects of their lives. But that's not all, we'll also go back in time to explore the fascinating world of dinosaurs! We'll discover incredible facts about these prehistoric creatures, from their impressive dimensions to their intriguing behaviors. Join us on a journey through history to unravel the mysteries surrounding these giants of the past. Get ready to dive into an ocean of curiosities and adventures, because today we will learn and have fun together in the fascinating realm of animals and dinosaurs! 🌍🦖🐬 Don't miss it! Let's start live and explore the wonderful world of nature together! Discover hundreds of never-before-seen resources!

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Hi, this is Kids Academy and in our new video for kids, you can learn english ABC alphabet.
The alphabet is a building block that helps kids to develop reading and writing skills.

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There is some debate which should be taught first – UPPERCASE letters of lowercase letters. On the one hand, uppercase letters are easier to identify and draw. On the other hand, most of what is written is in lowercase.
Whichever order you choose, we have prepared this entertaining video for teaching uppercase letters. Cute animals, natural phenomena and your kids’ favorite foods will introduce letters to your little ones and help them learn their ABCs.

00:00 - Start
00:16 - Letter A
00:30 - Letter B
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01:03 - Letter D
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02:21 - Letter I
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03:13 - Letter L
03:39 - Letter M
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This tutorial explains the different types of numbers commonly used in algebra. The number types discussed are counting, whole, integer, rational, irrational, and imaginary.

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Do you know how to calculate sales tax? In part six of our Financial Literacy for Kids series, you will learn how to do just that! Sales tax is an extra cost that is added to a product or service that you buy. The government uses sales tax money to pay for things, such as new roads and water lines.

Some states don't use a sales tax. Those states are Delaware, Alaska, Montana, New Hampshire, and Oregon. That means that if you want to buy something for $100, you only pay exactly $100, and no more. There are also states that don't charge sales tax on certain kinds of purchases, such as groceries and food or prescription medications.

Sales tax is calculated as a percentage of the purchase price of an item. Generally, the percentage is somewhere between 4% and 9%. Keep watching to follow along with the example to figure out how to calculate sales tax. You will also learn a cool trick for calculating sales tax easily!

We hope you and your student(s) enjoyed learning about these important skills! 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!

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What you will learn in Financial Literacy—Calculating Sales Tax:
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3:38 Can Frankie buy the book?

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Simple rules of geometry meant that 5-fold symmetry was impossible as were crystals without a periodic structure. This turns out to be wrong. Thanks to LastPass for sponsoring a portion of this video. Click here to start using LastPass: https://ve42.co/LPs

Huge thanks to Prof. Paul Steinhardt for the interview on this topic. Check out his book ‘The Second Kind of Impossible’

If you'd like to learn more about Penrose tilings, go check out "Penrose Tiles to Trapdoor Ciphers" by Martin Gardener, which helped my research for this video.

Filmed by Gene Nagata (Potato Jet on YouTube)
Animations by Ivy Tello and Jonny Hyman
Editing, Coloring, Music & Audio mastering by Jonny Hyman

Prague scenes filmed in 2012.
Special thanks to Raquel Nuno for helping with the tilings!

Additional Music from Epidemic Sound

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On today’s episode...CATS. Also: Hank talks about some philosophy stuff, like a few of the key concepts philosophers use when discussing belief and knowledge, such as what defines an assertion and a proposition, and that belief is a kind of propositional attitude. Hank also discusses forms of justification and the traditional definition of knowledge, which Edmund Gettier just totally messed with, using his Gettier cases.

Many thanks to Index the cat for his patience in the filming of this episode.
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Mushroom foragers rejoice! Your lives just got a whole lot easier! Now, we can farm four mushrooms that used to only be found in the wild: morels, huitlacoche, chanterelles, and truffles. Here's why it took so long.

Hosted by: Madelyn Leembruggen (she/her)
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They have some of the best caterpillars in Peru. The best.
Follow all of our Peru adventures on this playlist: http://bit.ly/SmartPeru
↓ More info and sources below ↓

Special thanks to Andy Warren, David Pfennig, Alex Wild, and Gustavo Londoño for helpful discussions for this video! #mimicry #rainforest

You should definitely be following Aaron Pomerantz:
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Twitter: @AaronPomerantz
IG: @nextgenscientist

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

Check out Deep Look for more awesome up-close science: https://www.youtube.com/user/KQEDDeepLook

Cinerous mourner nest video courtesy of Dano Grayson: http://danograyson.com/
Cinerous mourner photos by Santiago David

References:
d'Horta, Fernando Mendonça, Guy M. Kirwan, and Dante Buzzetti. "Gaudy juvenile plumages of cinereous mourner (Laniocera hypopyrra) and Brazilian laniisoma (Laniisoma elegans)." The Wilson Journal of Ornithology 124.3 (2012): 429-435.

Forbes, Peter. Dazzled and deceived: mimicry and camouflage. Yale University Press, 2011. http://amzn.to/2dE444Z

Kikuchi, David W., and David W. Pfennig. "Predator cognition permits imperfect coral snake mimicry." The American Naturalist 176.6 (2010): 830-834.

Londoño, Gustavo A., Duván A. García, and Manuel A. Sánchez Martínez. "Morphological and behavioral evidence of Batesian mimicry in nestlings of a lowland Amazonian bird." The American Naturalist 185.1 (2015): 135-141.

Rabosky, Alison R. Davis, et al. "Coral snakes predict the evolution of mimicry across New World snakes." Nature communications 7 (2016).

Savage, Jay M., and Joseph B. Slowinski. "The colouration of the venomous coral snakes (family Elapidae) and their mimics (families Aniliidae and Colubridae)." Biological Journal of the Linnean Society 45.3 (1992): 235-254.

Thompson, Martin J., and Martijn JTN Timmermans. "Characterising the phenotypic diversity of Papilio dardanus wing patterns using an extensive museum collection." Plos one 9.5 (2014): e96815.

Wickler, Wolfgang. Mimicry in Plants and Animals: Trans. by RD Martin. Weidenfeld & Nicolson, 1968.

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