For decades, Mars seemed like a cold, lifeless desert — until now. NASA’s Perseverance rover has stumbled upon something unbelievable: strange, seed-like shapes in the mysterious “Sapphire Canyon.” At the same time, scientists revealed Mars has a solid inner core — a feature shared only with Earth and the Moon. NASA’s sudden press conference has everyone asking the same question: did we just find proof that Mars isn’t as dead as we thought?

Credit:
Mars Perseverance Sol 1215: By NASA/JPL-Caltech/ASU, https://mars.nasa.gov/mars2020..../multimedia/raw-imag
Leopard Spots: By NASA/JPL-Caltech, https://science.nasa.gov/resou....rce/perseverance-fin
Right Mastcam-Z Camera: By NASA/JPL-Caltech/ASU, https://mars.nasa.gov/mars2020..../multimedia/raw-imag
Mars Perseverance Sol 1640: By NASA/JPL-Caltech, https://mars.nasa.gov/mars2020..../multimedia/raw-imag
Front Left Hazard Avoidance Camera: By NASA/JPL-Caltech, https://mars.nasa.gov/mars2020..../multimedia/raw-imag
Left Mastcam-Z Camera: By NASA/JPL-Caltech/ASU, https://mars.nasa.gov/mars2020..../multimedia/raw-imag
Perseverance Rover's images a rock: By NASA/JPL-Caltech/MSSS, https://svs.gsfc.nasa.gov/31352/
Mars Perseverance Sol 1215: Left Mastcam-Z Camera: By NASA/JPL-Caltech/ASU, https://mars.nasa.gov/mars2020..../multimedia/raw-imag
NASA’s Perseverance Mars Rover: By NASA/JPL-Caltech, https://images.nasa.gov/detail....s/JPL-20200727-M2020
Perseverance Rover Launch: By NASA's Goddard Space Flight Center, https://svs.gsfc.nasa.gov/13655/
Drill Bit: By Courtesy NASA/JPL-Caltech/ASU/MSSS, https://commons.wikimedia.org/....w/index.php?curid=15
Front Left Hazard Avoidance Camera: By NASA/JPL-Caltech, https://mars.nasa.gov/mars2020..../multimedia/raw-imag
Front Right Hazard Avoidance Camera: By NASA/JPL-Caltech, https://mars.nasa.gov/mars2020..../multimedia/raw-imag
CC BY 3.0 https://creativecommons.org/licenses/by/3.0:
microfossils: By Hannes Grobe, Alfred Wegener Institute, https://commons.wikimedia.org/....w/index.php?curid=62
CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/:
Trilete spores: By Smith609, https://commons.wikimedia.org/....w/index.php?curid=45
Vivianite 5: By Parent Géry, https://commons.wikimedia.org/....w/index.php?curid=22
Hematite: By DanielCD~commonswiki, https://commons.wikimedia.org/....w/index.php?curid=78
CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0:
Greigit: By Lodewicus de Honsvels, https://commons.wikimedia.org/....w/index.php?curid=16
CC BY 4.0 https://creativecommons.org/licenses/by/4.0:
Hemacollage: By SRob092, https://commons.wikimedia.org/....w/index.php?curid=15
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WEBSITE: http://www.teachertube.com Interior and Exterior Angles of a Polygon

Did you know the bald eagle almost didn’t become America’s national bird? There was another surprising contender in the mix. Want to know how it all went down? Watch this K12 Teaching Moment for an unexpected twist!

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Students explore the concepts of center of mass and static equilibrium by seeing how non-symmetrical objects balance. Using a paper cut-out shape of a parrot sitting on a wire coat hanger, they learn that their parrot exists in stable equilibrium — it returns to its balancing point after being disturbed. The weight of its tail makes the parrot balance upright. Give the parrot a push, and she knocks off balance, but swings back and forth until coming to rest in balance again.

View the full activity on TeachEngineering:
https://www.teachengineering.o....rg/activities/view/c

TeachEngineering has over 1,500 FREE lessons and activities. Visit https://www.teachengineering.org/ for more

Music: Daily Beetle - Kevin MacLeod

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Paint with less waste -- that's what a paint calculator is for! Watch for a complete guide on how to calculate how much paint you need for a work area.

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AI vs AI 100m Hurdles!
https://brilliant.org/AIWarehouse/
If you want to learn more about AI and deep reinforcement learning (how Albert is trained), there are amazing courses teaching those exact concepts on Brilliant! You can use my link to get 20% off! I've personally gone through the course "Introduction to Neural Networks", and it's one of the best courses on Neural Networks I've ever seen. They're paying us to promote them, but they're genuinely a great service, I've had a Brilliant account for over 5 years and can't recommend it enough :)

In this video Albert, Kai and three other AI Warehouse agents fight. The AI were trained using Deep Reinforcement Learning, a method of Machine Learning which involves rewarding the agent for doing something correctly, and punishing it for doing anything incorrectly. The agents actions are controlled by Neural Networks that are updated after each attempt in order to try to give the AI more rewards and less punishments over time

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MiaPrep also offers many hands-on learning activities including a business simulation, writing in the MiaPrep weekly, and creating artwork. Teaching social skills is also one of the key values at MiaPrep. On the site, kids can interact safely in a moderated environment and share their artwork, videos, and ideas with each other.

GCSE Maths revision tutorial video.

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🎶🗓️ Sing along and have fun every day of the week! From Monday to Sunday, this catchy Days of the Week Song by ABCmouse helps kids learn the order of the days while celebrating all the fun activities they can do. Perfect for preschoolers and young learners! 🌞✨

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Frank O'Hara is best known for his poetry, but in this Art Cooking we explore his life as a poet as well as an art curator at MoMA. Subscribe to Ours Poetica to receive regular doses of fresh poetry three times a week!: https://www.youtube.com/ourspoetica.
#frankohara #poetry #artcooking

Thanks to Kaveh Akbar (http://kavehakbar.com) and Paige Lewis (https://paigelewispoetry.com) for joining us and lending their reading talents. Explore more of O'Hara's work!: https://bit.ly/2SKIJvZ

Thanks to our Grandmasters of the Arts Tyler Calvert-Thompson, Divide by Zero Collection, David Golden, and Ernest Wolfe, and all of our patrons, especially Rich Clarey, Iain Eudaily, Tom Forwood, Patrick Hanna, Andrew Huynh, Eve Leonard, David Moore, Jane Quale, Gabriel Civita Ramirez, Constance Urist, Nicholas Xu, and Roberta Zaphiriou. To support our channel, visit: http://www.patreon.com/artassignment.

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Follow me to Out of Our Elements! ►► https://www.youtube.com/watch?v=tp-FsXHVFoU
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You’re alive right now… at least I’m pretty sure you are. But you’re not TOTALLY alive. Bits of you are always breaking down, being thrown out, and being replaced. Even right now, parts of you are dying. Some of your cells even died before you were born. And some will never come back. These are all very strange, mildly uncomfortable things to think about. And what’s even stranger than that is a big fraction of your body is, was, and will never be alive. So how much of you is dead?

References: https://sites.google.com/view/....how-much-of-you-is-a

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Why does sex exist? You might think the obvious answer is “reproduction” but there are plenty of organisms on Earth that don’t require sex to reproduce. And the more that scientists examined sex, they more they realized that it’s an expensive and inefficient way to get your genes to the next generation. The true purpose of sex is actually one of the longest-standing mysteries in evolutionary biology. But scientists are closer than ever to finding the answer. Here’s what we know about the evolutionary enigma of sex.

References: https://sites.google.com/view/....evolutionofsex-refer

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This chemistry video tutorial provides a basic introduction into the first law of thermodynamics. It shows the relationship between internal energy, heat, and work. It discusses the difference between the system and surroundings and distinguishes an open system from a closed system and an isolated system. In chemistry, work is positive whenever work is done on the system and work is negative whenever work is done by the system. During an exothermic process, heat flows out of the system and it flows into the system during an endothermic process.

First Law of Thermodynamics:
https://www.youtube.com/watch?v=NyOYW07-L5g

Thermochemistry Equations:
https://www.youtube.com/watch?v=GL3gCBUua4c

Internal Energy, Heat, and Work:
https://www.youtube.com/watch?v=E7s-hIoyNqY

Thermochemical Equations:
https://www.youtube.com/watch?v=qDrcHR4tSdE

Specific Vs Molar Heat Capacity:
https://www.youtube.com/watch?v=IoHXMaiwT80

________________________________
Basic Calorimetry Problems:
https://www.youtube.com/watch?v=BGcDUybbTW0

Final Temperature Calorimetry Problems:
https://www.youtube.com/watch?v=lxMwyxvSqgk

Latent Heat of Fusion & Vaporization:
https://www.youtube.com/watch?v=dxtz2POUTJE

Coffee Cup Calorimeter:
https://www.youtube.com/watch?v=-XnUypVXE88

More Calorimeter Problems:
https://www.youtube.com/watch?v=F2cMvNDRqQA

__________________________________
Specific Heat Capacity Problems:
https://www.youtube.com/watch?v=ePm_N6RgLfk

Hess Law Problems:
https://www.youtube.com/watch?v=2ixEf2zpR8E

More Hess Law Problems:
https://www.youtube.com/watch?v=Idv2C8HBbug

Enthalpy of Formation & Heat Combustion:
https://www.youtube.com/watch?v=FP-VYfTYi8Y

Enthalpy Practice Problems:
https://www.youtube.com/watch?v=Xe_N7WYl5BI

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

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

Full-Length Videos and Worksheets:
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We're still leading up to World War II, but first we gotta talk about the rise of the dictators. Today we talk about the rise of militaristic dictatorships in Germany, the Soviet Union, Japan, and Spain, and the economic depression that set the stage for their rise.

Sources
-Hunt, Lynn et al. Making of the West: Peoples and Cultures. 6th ed. Boston: Bedford St. Martins, 2019.
-Kershaw, Ian. Hitler, A Biography. New York: W. W. Norton, 2010.
-Kotkin, Stephen. Stalin: Waiting for Hitler, 1929-1941. New York: Penguin, 2017.
-Slezkine, Yuri. The House of Government: A Saga of the Russian Revolution. Princeton: Princeton University Press, 2017.
-Smith, Bonnie G. Europe in the Contemporary World, 1900 to the Present. 2nd ed. London: Bloomsbury, 2020.

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

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#crashcourse #europeanhistory #history

One of the most famous swords was the Cutlass, used by naval men for centuries but made famous by pirates.
The overall build of the Cutlass made it extremely popular among seafarers in the 17th and 18th centuries.
As a short broadsword, generally around 28 inches in length, the Cutlass was ideal for use on ships, where space was limited.

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Credit:
Created by Daniel Turner

Narrator:

Chris Kane
https://vocalforge.com/

Script: Conan White

Music Credit:
Celtic Impulse - Celtic by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/)
Source: http://incompetech.com/music/r....oyalty-free/index.ht
Artist: http://incompetech.com/

Sources:

https://pastebin.com/zHvRBHSz

¡Celebra el Amor y Aprende Español al Mismo Tiempo! En esta clase de español, te sumergirás en el mundo de las frases y diálogos de amor, parejas y San Valentín. Con 3 escenas románticas entre diferentes parejas, tendrás la oportunidad única de mejorar tu pronunciación y vocabulario en español. ¡No te pierdas esta experiencia de aprendizaje divertido y emocionante!


00:00 Conversaciones de pareja inicia
00:03 ¿Vamos a celebrar a ese restaurante que nos gusta tanto?
02:17 ¿Te acuerdas cuanado nos conocimos?
05:32 ¿Qué te parece si hacemos un viaje juntos?



Algunas frases típicas españolas que podemos aprender en el video:

"ya te tenía fichado": Se refiere a que ya le había visto
"enrollada con un tío": Que había encontrado pareja
"Festivalazo": Un festival muy bueno
"lugar emblemático": Los lugares emblemáticos son aquellos que son reconocidos por su importancia histórica, cultural, social o política.

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