How does caffeine keep us awake? - Hanan Qasim - TED-Ed


Video player loading... If video not loaded, Click here to Play now !
 
Why do we dream? - Amy Adkins 05:38
Why do we dream? - Amy Adkins
Play TED-Ed 2,359,351
View full lesson: http://ed.ted.com/lessons/why-do-we-dream-amy-adkins In the 3rd millennium BCE, Mesopotamian kings recorded and interpreted their dreams on wax tablets. In the years since, we haven't paused in our quest to understand why we dream. And while we still don’t have any definitive answers, we have some theories. Amy Adkins reveals the top seven reasons why we might dream. Lesson by Amy Adkins, animation by Clamanne Studio.
How does your body know you're full? - Hilary Coller 04:34
How does your body know you're full? - Hilary Coller
Play TED-Ed 414,670
Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/how-does-your-body-know-you-re-full-hilary-coller Hunger claws at your belly. It tugs at your intestines, which begin to writhe, aching to be fed. Being hungry generates a powerful and often unpleasant physical sensation that’s almost impossible to ignore. After you’ve reacted by gorging on your morning pancakes, you start to experience an opposing force: fullness. But how does your body actually know when you’re full? Hilary Coller explains. Lesson by Hilary Coller, directed by Sashko Danylenko. Thank you so much to our patrons for your support! Without you this video would not be possible. Noa Shore, Taylor Hunter, Kyle Nguyen,...
How does money laundering work? - Delena D. Spann 04:47
How does money laundering work? - Delena D. Spann
Play TED-Ed 1,084,602
View full lesson: http://ed.ted.com/lessons/how-does-money-laundering-work-delena-d-spann Money laundering is the term for any process that “cleans” illegally obtained funds of their “dirty” criminal origins, allowing them to be used within the legal economy. And the practice is about as old as money itself. But how does it actually work? Delena D. Spann describes the ins and outs of money laundering. Lesson by Delena D. Spann, animation by Juan M. Urbina.
What would happen if you didn’t drink water? - Mia Nacamulli 04:52
What would happen if you didn’t drink water? - Mia Nacamulli
Play TED-Ed 5,594,690
View full lesson: http://ed.ted.com/lessons/what-would-happen-if-you-didn-t-drink-water-mia-nacamulli Water is essentially everywhere in our world, and the average human is composed of between 55 and 60% water. So what role does water play in our bodies, and how much do we actually need to drink to stay healthy? Mia Nacamulli details the health benefits of hydration. Lesson by Mia Nacamulli, animation by Chris Bishop.
The language of lying — Noah Zandan 05:42
The language of lying — Noah Zandan
Play TED-Ed 9,023,786
View full lesson: http://ed.ted.com/lessons/the-language-of-lying-noah-zandan We hear anywhere from 10 to 200 lies a day. And although we’ve spent much of our history coming up with ways to detect these lies by tracking physiological changes in their tellers, these methods have proved unreliable. Is there a more direct approach? Noah Zandan uses some famous examples of lying to illustrate how we might use communications science to analyze the lies themselves. Lesson by Noah Zandan, animation by The Moving Company Animation Studio.
The power of the placebo effect - Emma Bryce 04:38
The power of the placebo effect - Emma Bryce
Play TED-Ed 826,498
View full lesson: http://ed.ted.com/lessons/the-power-of-the-placebo-effect-emma-bryce The placebo effect is an unexplained phenomenon wherein drugs, treatments, and therapies that aren’t supposed to have an effect — and are often fake — miraculously make people feel better. What’s going on? Emma Bryce dives into the mystery of placebos’ bizarre benefits. Lesson by Emma Bryce, animation by Globizco.
Why do some people go bald? - Sarthak Sinha 04:49
Why do some people go bald? - Sarthak Sinha
Play TED-Ed 952,680
View full lesson: http://ed.ted.com/lessons/why-do-some-people-go-bald-sarthak-sinha What do Charles Darwin, Michael Jordan, and Yoda have in common? They, like many other historical and fictive individuals, are bald. Scientists have long pondered, why do some people lose their hair, and how can we bring it back? Sarthak Sinha explores the basics of baldness. Lesson by Sarthak Sinha, animation by Brett Underhill.
What happens during a heart attack? - Krishna Sudhir 04:54
What happens during a heart attack? - Krishna Sudhir
Play TED-Ed 1,184,425
View full lesson: http://ed.ted.com/lessons/what-happens-during-a-heart-attack-krishna-sudhir Approximately seven million people around the world die from heart attacks every year. And cardiovascular disease, which causes heart attacks and other problems like strokes, is the world’s leading killer. So what causes a heart attack? Krishna Sudhir examines the leading causes and treatments of this deadly disease. Lesson by Krishna Sudhir, animation by Chadwick Whitehead.
What would happen if you didn’t sleep? - Claudia Aguirre 04:35
What would happen if you didn’t sleep? - Claudia Aguirre
Play TED-Ed 4,551,715
View full lesson: http://ed.ted.com/lessons/what-would-happen-if-you-didn-t-sleep-claudia-aguirre In the United States, it’s estimated that 30 percent of adults and 66 percent of adolescents are regularly sleep-deprived. This isn’t just a minor inconvenience: staying awake can cause serious bodily harm. Claudia Aguirre shows what happens to your body and brain when you skip sleep. Lesson by Claudia Aguirre, animation by TED-Ed.
Why Europeans And Asians Evolved So Differently 10:40
Why Europeans And Asians Evolved So Differently
Play Science Plus 3,771,973
Please Subscribe! http://testu.be/1FjtHn5 Early humans migrated all over the world to get us where we are today. The environments our ancestors inhabited made us all very different! + + + + + + + + TestTube Plus is built for enthusiastic science fans seeking out comprehensive conversations on the geeky topics they love. Host Trace Dominguez digs beyond the usual scope to deliver details, developments and opinions on advanced topics like AI, string theory and Mars exploration. TestTube Plus is also offered as an audio podcast on iTunes. + + + + + + + + Trace Dominguez on Twitter...
Why don't perpetual motion machines ever work? - Netta Schramm 05:31
Why don't perpetual motion machines ever work? - Netta Schramm
Play TED-Ed 2,625,402
View full lesson: http://ed.ted.com/lessons/why-don-t-perpetual-motion-machines-ever-work-netta-schramm Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? Netta Schramm describes the pitfalls of perpetual motion machines. Lesson by Netta Schramm, animation by TED-Ed.
Can you solve the egg drop riddle? - Yossi Elran 04:47
Can you solve the egg drop riddle? - Yossi Elran
Play TED-Ed 842,001
Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/can-you-solve-the-egg-drop-riddle-yossi-elran The city has just opened its one-of-a-kind Faberge Egg Museum, with a single egg displayed on each floor of a 100-story building -- and the world’s most notorious jewel thief already has her eyes on the prize. Can you help the thief formulate a plan that will drop the most expensive egg she can get safely into her waiting truck? Yossi Elran shows how. Lesson by Yossi Elran, directed by Artrake Studio. Thank you so much to our patrons for your support! Without you this video would not be possible! Yuh Saito, Sarabeth...
Why incompetent people think they're amazing - David Dunning 05:08
Why incompetent people think they're amazing - David Dunning
Play TED-Ed 1,041,917
Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/why-incompetent-people-think-they-re-amazing-david-dunning How good are you with money? What about reading people’s emotions? How healthy are you, compared to other people you know? Knowing how our skills stack up against others is useful in many ways. But psychological research suggests that we’re not very good at evaluating ourselves accurately. In fact, we frequently overestimate our own abilities. David Dunning describes the Dunning-Kruger effect. Lesson by David Dunning, directed by Wednesday Studio, music and sound by Tom Drew. Thank you so much to our patrons for your support! Without you this video would not be...
What causes kidney stones? - Arash Shadman 05:15
What causes kidney stones? - Arash Shadman
Play TED-Ed 753,057
View full lesson: http://ed.ted.com/lessons/what-causes-kidney-stones-arash-shadman The biggest kidney stone on record weighed more than a kilogram and was 17 centimeters in diameter. The patient didn’t actually swallow a stone the size of a coconut; kidney stones form inside the body. So how do they grow in the first place? And why are they so painful to get out? Arash Shadman shares the science behind kidney stones. Lesson by Arash Shadman, directed by TED-Ed.
History’s deadliest colors - J. V. Maranto 05:14
History’s deadliest colors - J. V. Maranto
Play TED-Ed 1,705,366
View full lesson: http://ed.ted.com/lessons/history-s-deadliest-colors-j-v-maranto When radium was first discovered, its luminous green color inspired people to add it into beauty products and jewelry. It wasn’t until much later that we realized that radium’s harmful effects outweighed its visual benefits. Unfortunately, radium isn’t the only pigment that historically seemed harmless or useful but turned out to be deadly. J. V. Maranto details history’s deadliest colors. Lesson by J. V. Maranto, animation by Juan M. Urbina.
The history of tea - Shunan Teng 04:58
The history of tea - Shunan Teng
Play TED-Ed 1,104,659
View full lesson: http://ed.ted.com/lessons/the-history-of-tea-shunan-teng Tea is the second most consumed beverage in the world after water –– and from sugary Turkish Rize tea to salty Tibetan butter tea, there are almost as many ways of preparing the beverage as there are cultures on the globe. Where did this beverage originate, and how did it become so popular? Shunan Teng details tea’s long history. Lesson by Shunan Teng, animation by Steff Lee.
Can you solve the pirate riddle? - Alex Gendler 05:24
Can you solve the pirate riddle? - Alex Gendler
Play TED-Ed 2,406,148
View full lesson: http://ed.ted.com/lessons/can-you-solve-the-pirate-riddle-alex-gendler It’s a good day to be a pirate. Amaro and his four mateys – Bart, Charlotte, Daniel, and Eliza have struck gold – a chest with 100 coins. But now, they must divvy up the booty according to the pirate code — and pirate code is notoriously complicated. Can you help come up with the distribution that Amaro should propose to make sure he lives to tell the tale? Alex Gendler shows how. Lesson by Alex Gendler, animation by Artrake Studio.
Is it bad to hold your pee? - Heba Shaheed 03:58
Is it bad to hold your pee? - Heba Shaheed
Play TED-Ed 1,799,392
View full lesson: http://ed.ted.com/lessons/is-it-bad-to-hold-your-pee-heba-shaheed Humans should urinate at least four to six times a day, but occasionally, the pressures of modern life force us to clench and hold it in. How bad is this habit, and how long can our bodies withstand it? Heba Shaheed takes us inside the bladder to find out. Lesson by Heba Shaheed, animation by Artrak Studio.
Why is it so hard to cure cancer? - Kyuson Yun 05:23
Why is it so hard to cure cancer? - Kyuson Yun
Play TED-Ed 571,859
Download a free audiobook and support TED-Ed's nonprofit mission: http://adbl.co/2gauxND Check out Siddhartha Mukherjee's "The Emperor of All Maladies": https://shop.ed.ted.com/collections/ted-ed-book-recommendations/products/the-emperor-of-all-maladies-a-biography-of-cancer View full lesson: https://ed.ted.com/lessons/why-is-it-so-hard-to-cure-cancer-kyuson-yun We’ve harnessed electricity, sequenced the human genome, and eradicated smallpox. But after billions of dollars in research, we haven’t found a solution for a disease that affects more than 14 million people and their families at any given time. Why is it so difficult to cure cancer? Kyuson Yun explains the challenges. Lesson by Kyuson Yun, directed by Artrake Studio. Check out our Patreon page: https://www.patreon.com/teded Thank you so much to our patrons for your support! Without you this video...
What is entropy? - Jeff Phillips 05:20
What is entropy? - Jeff Phillips
Play TED-Ed 828,120
View full lesson: http://ed.ted.com/lessons/what-is-entropy-jeff-phillips There’s a concept that’s crucial to chemistry and physics. It helps explain why physical processes go one way and not the other: why ice melts, why cream spreads in coffee, why air leaks out of a punctured tire. It’s entropy, and it’s notoriously difficult to wrap our heads around. Jeff Phillips gives a crash course on entropy. Lesson by Jeff Phillips, animation by Provincia Studio.
Maybe There Isn't Liquid Water on Mars 06:27
Maybe There Isn't Liquid Water on Mars
Play SciShow Space 16,810
Two years ago we were very excited about the announcement of water on Mars, but some new research challenges that idea. And one of our most successful exoplanet finding tools has discovered another one, this time pretty close to home! SciShow Finds: https://scishowfinds.com ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Sam Lutfi, Kevin Knupp, Nicholas Smith, Inerri, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Bella Nash, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer,...
Poison vs. venom: What's the difference? - Rose Eveleth 03:56
Poison vs. venom: What's the difference? - Rose Eveleth
Play TED-Ed 1,556,232
View full lesson: http://ed.ted.com/lessons/venom-vs-poison-what-s-the-difference-rose-eveleth Would you rather be bitten by a venomous rattlesnake or touch a poisonous dart frog? While both of these animals are capable of doing some serious damage to the human body, they deliver their dangerous toxins in different ways. Rose Eveleth sheds light on the distinction between poison and venom (and why you shouldn't treat either one like you've seen in the movies). Lesson by Rose Eveleth, animation by TED-Ed.
The great conspiracy against Julius Caesar - Kathryn Tempest 05:58
The great conspiracy against Julius Caesar - Kathryn Tempest
Play TED-Ed 2,159,113
View full lesson: http://ed.ted.com/lessons/the-great-conspiracy-against-julius-caesar-kathryn-tempest On March 15th, 44 BCE, Roman dictator Julius Caesar was assassinated by a group of about 60 of his own senators. Why did these self-titled Liberators want him dead? And why did Brutus, whose own life had been saved by Caesar, join in the plot? Kathryn Tempest investigates the personal and political assassination of Julius Caesar. Lesson by Kathryn Tempest, animation by Brett Underhill.
Why are sloths so slow? - Kenny Coogan 05:15
Why are sloths so slow? - Kenny Coogan
Play TED-Ed 1,242,275
View full lesson: http://ed.ted.com/lessons/why-are-sloths-so-slow-kenny-coogan Sloths spend most of their time eating, resting, or sleeping; in fact, they descend from their treetops canopies just once a week, for a bathroom break. How are these creatures so low energy? Kenny Coogan describes the physical and behavioral adaptations that allow sloths to be so slow. Lesson by Kenny Coogan, animation by Anton Bogaty.
Video Description
View full lesson: http://ed.ted.com/lessons/how-does-caffeine-keep-us-awake-hanan-qasim

Over 100,000 metric tons of caffeine are consumed around the world every year. That’s equivalent to the weight of 14 Eiffel Towers! Caffeine helps us feel alert, focused, and energetic, even if we haven’t had enough sleep — but it can also raise our blood pressure and make us feel anxious. So how does it keep us awake? Hanan Qasim shares the science behind the world’s most widely used drug.

Lesson by Hanan Qasim, directed by Adriatic Animation.
Tags: How does caffeine keep us awake?   Hanan Qasim   TED   TED   Ed   TED Education   TED Ed   Hanan Qasim   Adriatic Animation   caffeine   adenosine   dopamine   stimulant   brain   neuron   receptor   inhibitor   coffee   tea   soda   chocolate   energy   drug   central nervous system   ATP  

Author information

TED-Ed
Videos: 1,393
Subscriber: 5,406,735
Views: 777,230,190

TED-Ed’s commitment to creating lessons worth sharing is an extension of TED’s mission of spreading great ideas. Within TED-Ed’s growing library of TED-Ed animations, you will find carefully curated educational videos, many of which represent collaborations between talented educators and animators nominated through the TED-Ed website (ed.ted.com). Want to suggest an idea for a TED-Ed animation or get involved with TED-Ed? Visit our website at: http://ed.ted.com/get_involved. Also, consider donating to us on Patreon! By doing so, you directly support our mission and receive some pretty awesome rewards: https://www.patreon.com/teded


ADV