Top videos | TeacherFlix | Free Classroom Videos & Ready-to-Use Lesson Resources

Home
Articles

Top videos

All Time

Today

This week

This month

This year

What Color is the Universe? Teacherflix 2 Views • 7 months ago

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

Hint: It's not black
Don’t miss our next video! SUBSCRIBE! ►► http://bit.ly/iotbs_sub
↓↓↓ More info and sources below ↓↓↓

When you stare up at the night sky, you might think that the universe is really black, but that's just because our eyes aren't sensitive enough to see the billions and billions of multicolored stars out there. Ever wonder why certain stars are certain colors? And what color is our sun, really? If we looked at enough stars, could we figure out the average color of the universe?

Read more:
Stellar classification: http://en.wikipedia.org/wiki/S....tellar_classificatio
What color is the sun: http://casa.colorado.edu/~ajsh..../colour/Tspectrum.ht
Star colors in hex code: http://blogs.discovermagazine.....com/badastronomy/201
Color of the Milky Way: http://www.news.pitt.edu/milkywaycolor
Average color of the universe (cosmic latte): http://apod.nasa.gov/apod/ap020702.html

Have an idea for an episode or an amazing science question you want answered? Leave a comment below!
Follow on Twitter: http://twitter.com/okaytobesmart
http://twitter.com/jtotheizzoe
Follow on Tumblr: http://www.itsokaytobesmart.com
Follow on Instagram: http://instagram.com/jtotheizzoe

-----------------
It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.D
Follow me on Twitter: @DrJoeHanson
Instagram: @DrJoeHanson
Email me: itsokaytobesmart AT gmail DOT com
Facebook: http://www.facebook.com/itsokaytobesmart

Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
Andrew Matthews - Editing/Motion Graphics/Animation
Katie Graham - Director of Photography
John Knudsen - Gaffer
Dalton Allen - Post-Production Intern

Theme music:
"Ouroboros" by Kevin MacLeod

Other music via APM

Stock images from Shutterstock

-----------------

Last week's video: Attack of the Zombie Parasites https://www.youtube.com/watch?v=AgCQStTSMuk

More videos:
Why Does February Have 28 Days? https://www.youtube.com/watch?v=AgKaHTh-_Gs
Why Vaccines Work https://www.youtube.com/watch?v=3aNhzLUL2ys
Why Are Some People Left-Handed? https://www.youtube.com/watch?v=NPvMUpcxPSA
Where Does the Smell of Rain Come From? https://www.youtube.com/watch?v=lGcE5x8s0B8

The Strange Science of Why We Dream Teacherflix 2 Views • 7 months ago

Take the PBS Digital Studios audience survey: https://to.pbs.org/2021survey
We’re on PATREON! Join the community https://www.patreon.com/itsokaytobesmart
↓↓↓ More info and sources below ↓↓↓

It would be a lot easier to study the science of dreaming if we weren’t asleep every time we did it. Why do we dream? What does dreaming do for our brains? How did dreaming evolve? Here’s a look at the current theories from psychology and neuroscience.

References:
Barrett, D. (2017), Dreams and creative problem-solving. Ann. N.Y. Acad. Sci., 1406: 64-67. https://doi.org/10.1111/nyas.13412
Carlo Cipolli, Roberto Bolzani, Cesare Comoldi, Rossana De Beni, Iino Fagioli, Bizarreness Effect in Dream Recall, Sleep, Volume 16, Issue 2, March 1993, Pages 163–170, https://doi.org/10.1093/sleep/16.2.163
Eagleman DM, Vaughn DA (2021). The Defensive Activation Theory: REM Sleep as a Mechanism to Prevent Takeover of the Visual Cortex. Frontiers in Neuroscience. 15:632853. doi: 10.3389/fnins.2021.632853
El-Solh, A. A. (2018). Management of nightmares in patients with posttraumatic stress disorder: Current perspectives. Nature and Science of Sleep, 10, 409–420.https://pubmed.ncbi.nlm.nih.gov/30538593/
Hughes, J. Donald. (2000). Dream Interpretation in Ancient Civilizations. Dreaming. 10. 7-18. 10.1023/A:1009447606158.
Káli, S., Dayan, P. Off-line replay maintains declarative memories in a model of hippocampal-neocortical interactions. Nature Neuroscience 7, 286–294 (2004). https://doi.org/10.1038/nn1202
Montangero, Jacques & Ivanyi, Corinne & Saint-Hilaire, Zara. (2003). Completeness and accuracy of morning reports after a recall cue: Comparison of dream and film reports. Consciousness and cognition. 12. 49-62. 10.1016/S1053-8100(02)00029-6.
Stickgold, R., Malia, A.; Maguire, D., Roddenberry, D., O'Connor, M. (2000). Replaying the Game: Hypnagogic Images in Normals and Amnesics. Science. 290 (5490): 350–353. doi:10.1126/science.290.5490.350.
Valli, K., Revonsuo, A., Pälkäs, O., Ismail, K. H., Ali, K. J., & Punamäki, R.-L. (2005). The threat simulation theory of the evolutionary function of dreaming: Evidence from dreams of traumatized children. Consciousness and Cognition, 14(1), 188–218. https://pubmed.ncbi.nlm.nih.gov/15766897/
van der Linden, S. The Science Behind Dreaming. Scientific American. July 26, 2011
Erin J. Wamsley, PhD, Karen Perry, MD, Ina Djonlagic, MD, Laura Babkes Reaven, MD, Robert Stickgold, PhD, Cognitive Replay of Visuomotor Learning at Sleep Onset: Temporal Dynamics and Relationship to Task Performance, Sleep, Volume 33, Issue 1, January 2010, Pages 59–68, https://doi.org/10.1093/sleep/33.1.59
-----------

Special thanks to our Brain Trust Patrons:

Barbora Bei
Ken Board
T Clinger
Attila Pix
Burt Humburg
DeliciousKashmiri
Brian Chang
Roy Lasris
dani bowman
David Johnston
Salih Arslan
Baerbel Winkler
Robert Young
Amy Sowada
Eric Meer
Dustin
Karen Haskell
AlecZero

Join us on Patreon!
https://patreon.com/itsokaytobesmart

Twitter
http://www.twitter.com/DrJoeHanson
http://www.twitter.com/okaytobesmart

Instagram
http://www.instagram.com/DrJoeHanson
http://www.instagram.com/okaytobesmart

Merch
https://store.dftba.com/collec....tions/its-okay-to-be

Facebook
https://www.facebook.com/itsokaytobesmartpbs/

The Surprising Places We Waste Energy Teacherflix 2 Views • 7 months ago

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

Check out our whole series on ENERGY! http://bit.ly/1BnH5zu
Subscribe: http://bit.ly/iotbs_sub Twitter: @okaytobesmart
↓ More info and sources below ↓

We use a LOT of energy, but we waste a lot too. Where that waste happens might surprise, you though. We don't just waste energy when we leave the lights on or the thermostat cranked down too low. It happens at the dinner table and the water faucet as too!

LEARN MORE:
Special thanks to Sheril Kirshenbaum and the Webber Energy Group at the University of Texas at Austin for their help with this series. http://www.webberenergygroup.com/

Check out their awesome online course "Energy 101" to learn about energy and energy policy from A to Z! http://www.energy101.com/

And to find out what people think about energy, check out the UT Energy Poll: http://www.utenergypoll.com/

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!
Follow on Twitter: http://twitter.com/okaytobesmart
http://twitter.com/jtotheizzoe
Follow on Tumblr: http://www.itsokaytobesmart.com
Follow on Instagram: http://instagram.com/jtotheizzoe

-----------------
It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.DFollow me on Twitter: @jtotheizzoe
Email me: itsokaytobesmart AT gmail DOT com
Facebook: http://www.facebook.com/itsokaytobesmart
Google+ https://plus.google.com/+itsokaytobesmart
For more awesome science, check out: http://www.itsokaytobesmart.com
Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
Andrew Matthews - Editing/Motion Graphics/Animation
Katie Graham - Director of Photography
John Knudsen - Gaffer

Theme music:
"Ouroboros" by Kevin MacLeod

Other music via APM

Stock images from Shutterstock, stock footage from Videoblocks

-----------------

Last week's video:
Does the Moon Orbit the Earth? https://www.youtube.com/watch?v=3cJ3AemeUFM

More videos:
Why Does February Have 28 Days? https://www.youtube.com/watch?v=AgKaHTh-_Gs
Why Vaccines Work https://www.youtube.com/watch?v=3aNhzLUL2ys
Why Are Some People Left-Handed? https://www.youtube.com/watch?v=NPvMUpcxPSA
Where Does the Smell of Rain Come From? https://www.youtube.com/watch?v=lGcE5x8s0B8

Why Are Some Animals Venomous? Teacherflix 2 Views • 7 months ago

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

Check out “Venomous” by Christie Wilcox: http://bit.ly/VenomousBook
Help us translate this video! http://www.youtube.com/timedtext_video?ref=share&v=Qd92MuVZXik
↓ More info and sources below ↓

Get yourself an awesome IOTBS shirt! http://dftba.com/besmart

Learn more:
LD50’s of various venomous snakes: http://snakedatabase.org/pages/LD50.php

Lynne Isbell’s “The Fruit, the Tree, and the Serpent” http://amzn.to/2afXQ91

Fry, Bryan G., et al. "Early evolution of the venom system in lizards and snakes." Nature 439.7076 (2006): 584-588. http://www.nature.com/nature/j....ournal/v439/n7076/ab

Reyes-Velasco, Jacobo, et al. "Expression of venom gene homologs in diverse python tissues suggests a new model for the evolution of snake venom." Molecular biology and evolution 32.1 (2015): 173-183. http://mbe.oxfordjournals.org/....content/32/1/173.sho

Drabeck, Danielle H., Antony M. Dean, and Sharon A. Jansa. "Why the honey badger don't care: Convergent evolution of venom-targeted nicotinic acetylcholine receptors in mammals that survive venomous snake bites."Toxicon 99 (2015): 68-72. http://www.sciencedirect.com/s....cience/article/pii/S

Opossum venom resistance: https://www.acs.org/content/ac....s/en/pressroom/newsr

Reddit AMA with Steve Ludwin, a snake venom self-immunizer: https://www.reddit.com/r/IAmA/....comments/17hzhk/iama

Van Le, Quan, et al. "Pulvinar neurons reveal neurobiological evidence of past selection for rapid detection of snakes." Proceedings of the National Academy of Sciences 110.47 (2013): 19000-19005. http://www.pnas.org/content/110/47/19000.short

Thrasher, Cat, and Vanessa LoBue. "Do infants find snakes aversive? Infants’ physiological responses to “fear-relevant” stimuli." Journal of experimental child psychology 142 (2016): 382-390. http://www.sciencedirect.com/s....cience/article/pii/S

----------------
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!
Facebook: http://www.facebook.com/itsokaytobesmart
Twitter: http://twitter.com/okaytobesmart
http://twitter.com/jtotheizzoe
Tumblr: http://www.itsokaytobesmart.com
Instagram: http://instagram.com/jtotheizzoe
Snapchat: YoDrJoe

Produced by PBS Digital Studios
Music via APM
Stock images from SciencePhoto http://www.sciencephoto.com/ and Shutterstock http://www.shutterstock.com
Stock footage from Videoblocks (unless otherwise noted) http://www.videoblocks.com

The Science of Game of Thrones Teacherflix 2 Views • 7 months ago

Valar more-curious!

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

SUBSCRIBE, it's FREE! http://bit.ly/iotbs_sub
↓ More info and sources below ↓

WINTER:
Seasons of Westeros and the 3-body problem: http://arxiv.org/pdf/1304.0445v1.pdf
Other possible explanations for the seasons: http://io9.com/5906300/5-scien....tific-explanations-f
Why those other reasons are wrong:
http://bit.ly/1hYuRDJ
http://boingboing.net/2012/05/....14/great-moments-in-
http://www.sciencedirect.com/s....cience/article/pii/S
http://en.wikipedia.org/wiki/Milankovitch_cycles

NOTE ON MOONS AND STABILIZATION: I'm adding this comment after the video goes up: In retrospect I should have said that a moon doesn't *necessarily* have to be present to stabilize a planet. While our moon does cancel out some tugging from the other planets in the solar system, here's a recent paper shows that moonless planets can orbit with great stability even without the influence of a moon. Basically moons aren't required for stability: http://barnesos.net/publicatio....ns/papers/2012.01.Ic

Even more reasons for the seasons: http://www.tor.com/blogs/2011/....05/how-seasons-qwork

GEOLOGY:
Generation Anthropocene's AMAZING geologic history of Westeros and Essos: http://www.stanford.edu/group/....anthropocene/cgi-bin

VALYRIAN STEEL:
Damascus steel: http://en.wikipedia.org/wiki/Damascus_steel

DRAGON FIRE:
Kyle Hill's explanation for real-life dragon fire: http://blogs.scientificamerica....n.com/but-not-simple

DRAGON FLIGHT:
Dragon-sized birds are biologically impossible: http://wapo.st/1lBV2RE

WILDFIRE:
Greek fire: http://www.sciforums.com/what-....is-greek-fire-t-6854
Trimethyl borate flame by hkparker: https://www.youtube.com/watch?v=6OrisgbsRmg

MILK OF POPPY:
Opates: http://en.wikipedia.org/wiki/Opium

THE WALL:
Compression melting of ice: http://www.reddit.com/r/asksci....ence/comments/1qkdl0

DIRE WOLVES:
Canis dirus: http://en.wikipedia.org/wiki/Dire_wolf

REAL-LIFE CHARACTERS:
Abandon all productivity ye who click here: http://history-behind-game-of-thrones.com
Stark/Lannister feud in real life tapestry: http://history-behind-game-of-thrones.com/wp-content/uploads/2014/03/porte_saint_denis170-753x1024.jpg

Joe Hanson - Host and writer
Joe Nicolosi - Director
Amanda Fox - Producer, Spotzen IncKate Eads - Associate Producer
Katie Graham - Director of Photography
Edited by Stephanie Noone and Kirby Conn from Arts & Labor
John Knudsen - Gaffer

Music:
"Ouroboros" by Kevin MacLeod

Produced by PBS Digital Studios: http://www.youtube.com/user/pbsdigitalstudios

-----------
Join us on Patreon!
https://patreon.com/itsokaytobesmart

Twitter
http://www.twitter.com/DrJoeHanson
http://www.twitter.com/okaytobesmart

Instagram
http://www.instagram.com/DrJoeHanson
http://www.instagram.com/okaytobesmart

Merch
https://store.dftba.com/collec....tions/its-okay-to-be

Facebook
https://www.facebook.com/itsokaytobesmartpbs/

Is Epigenetic Inheritance Real? Teacherflix 2 Views • 7 months ago

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

Epigenetic inheritance is really weird, but is it real?
Tweet this ⇒ http://bit.ly/OKTBSepi Share on FB ⇒ http://bit.ly/OKTBSepiFB
↓ More info and sources below ↓

Crash Course Physics with Dr. Shini Somara: https://www.youtube.com/user/crashcourse

Want more on epigenetic inheritance? Start here:
Univ. of Utah’s Learn Genetics: http://learn.genetics.utah.edu..../content/epigenetics
Virginia Hughes - “Epigenetics: The Sins of the Father” http://www.nature.com/news/epi....genetics-the-sins-of

Dig deeper:

Szyf, Moshe. "Nongenetic inheritance and transgenerational epigenetics."Trends in molecular medicine 21.2 (2015): 134-144.
Sharma, Abhay. "Transgenerational epigenetic inheritance requires a much deeper analysis." Trends in molecular medicine 21.5 (2015): 269-270.
Heard, Edith, and Robert A. Martienssen. "Transgenerational epigenetic inheritance: myths and mechanisms." Cell 157.1 (2014): 95-109.
Rando, Oliver J. "Daddy issues: paternal effects on phenotype." Cell 151.4 (2012): 702-708.
Jablonka, Eva, and Gal Raz. "Transgenerational epigenetic inheritance: prevalence, mechanisms, and implications for the study of heredity and evolution." The Quarterly review of biology 84.2 (2009): 131-176.
Heijmans, Bastiaan T., et al. "Persistent epigenetic differences associated with prenatal exposure to famine in humans." Proceedings of the National Academy of Sciences 105.44 (2008): 17046-17049.
Pembrey, Marcus, et al. "Human transgenerational responses to early-life experience: potential impact on development, health and biomedical research." Journal of medical genetics (2014): jmedgenet-2014.

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!
Like us on Facebook: http://www.facebook.com/itsokaytobesmart
Follow on Twitter: http://twitter.com/okaytobesmart
http://twitter.com/jtotheizzoe
Follow on Tumblr: http://www.itsokaytobesmart.com
Follow on Instagram: http://instagram.com/jtotheizzoe
Follow on Snapchat: YoDrJoe

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

Music via APM
Stock images from Shutterstock http://www.shutterstock.com
Stock footage from Videoblocks (unless otherwise noted) http://www.videoblocks.com

Who Invented the Metric System (and Why It Isn’t As Perfect as You Think) Teacherflix 2 Views • 7 months ago

Meter? …or Metre?
Try CuriosityStream and learn something new today: http://curiositystream.com/smart
↓ More info and sources below ↓

Why is a meter a meter? The meter is the world’s ultimate measure, but how did it become “the” meter? What is this measurement based on? The story of this revolution in measurement traces its roots to the French Revolution. Scientists decided that an equal and united people should have equal and united measures. So they sent a pair of young astronomers out to measure the world, and invent the meter. Little did they know they’d find nothing but war, deception, and strife along the way. As a result of this ill-fated mission, the meter carries an error that still persists today. Still think the metric system is so perfect?

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

-----------
LEARN MORE:
This episode would not have been possible without one incredible book: “The Measure of All Things” by Ken Alder.
There’s so much more to this story that we couldn’t fit in the video, and this book has it all. War, madness, deception, shame, spies, the dawn of the Enlightenment, the birth of modern economics, lots more beheadings… Highly recommended!
Amazon: http://amzn.to/2lNuEyD
Public library: http://www.worldcat.org/oclc/893130606

MORE:
Interesting chronology of the meter: http://www.dozenalsociety.org.....uk/metrix/chronology

Calculating the length of a meridian arc: http://www.cantab.net/users/mi....chael.behrend/map_fo

Williams, Jeffrey H. “Quantifying Measurement: The Tyranny of Numbers.” Morgan & Claypool Publishers, 2016

Murdin, Paul. “Full meridian of glory: perilous adventures in the competition to measure the Earth.” Springer Science & Business Media, 2008.

-----------
FOLLOW US:

Merch: https://store.dftba.com/collec....tions/its-okay-to-be
Facebook: http://www.facebook.com/itsokaytobesmart
Twitter: @okaytobesmart @DrJoeHanson
Tumblr: http://www.itsokaytobesmart.com
Instagram: @DrJoeHanson
-----------

It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D.
Director: Joe Nicolosi
Writer: Joe Hanson
Producer/editor/animator: Andrew Matthews
Producer: Stephanie Noone and Amanda Fox

Produced by PBS Digital Studios
Music via APM
Stock images from Shutterstock http://www.shutterstock.com