Why Contacting Extraterrestrials Could Be Risky (Dark Forest Hypothesis)

Is Space a Thing?

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate Try 23andMe: http://www.23andme.com/okay Don’t miss our next video! SUBSCRIBE! ►► http://bit.ly/iotbs_sub ↓↓↓ More info and sources below ↓↓↓ Since the days of Ancient Greece, philosophers and scientists have been wondering: What is space? Is the absence of things… a thing? These questions continued to fascinate physicists in the modern era, leading Isaac Newton, Ernst Mach, and Albert Einstein to wonder about the true nature of the fabric of the cosmos. The search for an answer led them to some of the greatest theories in physics. This week, we ask if space and time are really real, and how they come together to make “spacetime”! ----------- READ MORE: “The Fabric of the Cosmos” by Brian Greene http://amzn.to/2tF9fZO (Public library: http://www.worldcat.org/oclc/681349969) ----------- FOLLOW US: Merch: https://store.dftba.com/collections/its-okay-to-be-smart Facebook: http://www.facebook.com/itsokaytobesmart Twitter: @okaytobesmart @DrJoeHanson Tumblr: http://www.itsokaytobesmart.com Instagram: @DrJoeHanson Snapchat: YoDrJoe ----------- It’s Okay To Be Smart is hosted by Joe Hanson, Ph.D. Director: Andrew Matthews Writer: Andrew Matthews 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 Learn more about your ad choices. Visit megaphone.fm/adchoices [https://megaphone.fm/adchoices]

Which Came First - Blossoms or Bees?

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate Stop and smell the flowers… and watch this video Subscribe: http://bit.ly/iotbs_sub Twitter: @jtotheizzoe @okaytobesmart ↓ More info and sources below ↓ Bees and flowers have an amazingly close relationship. Flowers need bees in order to reproduce, and bees need flowers to feed their colonies. Take away one, and the other would disappear too. It begs the question: When it comes to evolution, which came first, the bees or the flowers? Book recommendation: "A Sting in the Tale" by Dave Goulson, a great scientific and cultural history of bees http://amzn.to/1BcytS5 Special thanks to the Lady Bird Johnson Wildflower Center in Austin, TX for letting us hang out with their bees and flowers! https://www.wildflower.org/ More info/sources: http://www.scientificamerican.com/article/the-beguiling-history-of-bees-excerpt/ http://www.the-scientist.com/?articles.view/articleNo/38733/title/On-The-Origin-of-Flowers/ http://www.bbc.com/earth/story/20141017-how-flowers-conquered-the-world http://science.nationalgeographic.com/science/prehistoric-world/big-bloom/ 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: The Energy Series! https://www.youtube.com/playlist?list=PLsmqeqKj7M-q499mOUvNa3iRreFBzxaQx 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 Learn more about your ad choices. Visit megaphone.fm/adchoices [https://megaphone.fm/adchoices]

What's The Loudest Sound That Could Exist?

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate It's definitely higher than "11" Subscribe: http://bit.ly/iotbs_sub Twitter: @okaytobesmart ↓ More info and sources below ↓ What is the loudest possible sound? What about the quietest thing we can hear? And what do decibels measure, anyway? In this video you'll learn what makes sound The loudest sound on Earth (the we know of anyway), great story by Aatish Bhatia: http://nautil.us/blog/the-sound-so-loud-that-it-circled-the-earth-four-times Video of the Papua New Guinea volcano eruption from YouTuber bacobjee: https://www.youtube.com/watch?v=BUREX8aFbMs Calculation of the shock wave from teleportation: http://www.quora.com/Teleportation/If-you-were-to-disappear-suddenly-how-loud-would-be-the-noise-of-the-air-filling-up-the-vacuum-youve-left The sometimes-painful effects of different sound pressure levels: http://www.makeitlouder.com/Decibel%20Level%20Chart.txt How loud are rocket launches? http://testtube.com/dnews/how-loud-are-space-shuttle-launches/ NASA's sound suppression water system: https://www.youtube.com/watch?v=9LehY5avJUM Can a sound be loud enough to kill you? http://www.straightdope.com/columns/read/2298/can-a-noise-be-loud-enough-to-kill-you ----------------- It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.D Follow me on Twitter/Instagram: @DrJoeHanson @okaytobesmart Email me: itsokaytobesmart AT gmail DOT com Facebook: http://www.facebook.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 Jen Piper/Arts+Labor - 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 French subtitles by Alessandro Dal Cero Learn more about your ad choices. Visit megaphone.fm/adchoices [https://megaphone.fm/adchoices]

Did Dinosaurs Truly Become Extinct?

Welcome to… Jurassic Pluck Subscribe: http://bit.ly/iotbs_sub Twitter: @DrJoeHanson @okaytobesmart ↓ More info and sources below ↓ Most people are taught that dinosaurs went extinct 66 million years ago when a giant meteor crashed into the Yucatan peninsula. I'm here to tell you that's wrong. Dinosaurs are alive and well today, and you don't have to go to Jurassic World to see them (although hanging out with Chris Pratt would be cool) We have living dinosaurs all around us. We just call them "birds". Yes. Birds are dinosaurs. Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate The tetrapod playlist: https://www.youtube.com/playlist?list=PLsmqeqKj7M-oVnyE5_1x-dUFYHxLLQmRD Special thanks to Scott Hartman (http://www.skeletaldrawing.com/) for the great Deinonychus and Archaeopteryx illustrations More info/sources: Great Audubon article on dinosaur-bird evolution http://www.audubon.org/magazine/january-february-2015/which-came-first-dinosaur-or-bird Dig deeper with this hour-long Yale lecture by Dr. Richard Prum: https://www.youtube.com/watch?v=Ao7Q8kOqjfs Dr. John Hutchinson's research on dinosaur/bird posture http://whatsinjohnsfreezer.com/2013/04/24/3d_dinosaurs/ Chickens wearing prosthetic tails, for science! http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0088458 T. rex had a wishbone: http://www.smithsonianmag.com/science-nature/this-thanksgiving-make-a-wish-on-a-dinosaur-87598064/?no-ist Did prey grasping of dinosaurs evolve into bird flight stroke? http://www.ucmp.berkeley.edu/vertebrates/flight/aves.html Reconstructing dinosaur sounds http://www.sandia.gov/LabNews/LN12-19-97/dinosaur_story.html Great TED-Ed video on the evolution of feathers in dinosaurs: https://www.youtube.com/watch?v=hPLgfGX1I5Y Brian Switek on dinosaur feathers: http://www.smithsonianmag.com/ist/?next=/science-nature/feathers-fuel-dinosaur-flight-debate-146139689/ What do birds see? http://www.nwf.org/news-and-magazines/national-wildlife/birds/archives/2012/bird-vision.aspx Tetrachromacy and feathers in dinosaurs: http://www.sciencemag.org/content/346/6208/416.short 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/DrJoeHanson Follow on Tumblr: http://www.itsokaytobesmart.com Follow on Instagram: http://instagram.com/drjoehanson 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 Birds of paradise clips via PBS Nature Learn more about your ad choices. Visit megaphone.fm/adchoices [https://megaphone.fm/adchoices]

The Surprising Places We Squander Power

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 Learn more about your ad choices. Visit megaphone.fm/adchoices [https://megaphone.fm/adchoices]