A rare look inside the Svalbard Global Seed Vault which is closed ~350 days a year
Check out Audible: http://bit.ly/AudibleVe
More info on the seed vault: http://wke.lt/w/s/EKFlK
My trip to Norway was funded by Screen Australia, Film Victoria and Genepool Productions as part of a new project. More information soon.

Special thanks to Bente Naeverdal and the Crop Trust: https://www.croptrust.org

Can you trust your phone? Head to https://brilliant.org/veritasium to start your free 30-day trial and get 20% off an annual premium subscription.

A huge thank you to Linus Sebastian and the team at Linus Tech Tips - check them out at @LinusTechTips

A massive thank you to Alexandre De Oliveira and Karsten Nohl (aka @hackingmatters) for making this demo possible. Karsten has made a great follow-up video on the subject, which you can watch here: https://www.youtube.com/watch?v=miXRoy-5LLo

A special thanks to Crofton Black at Lighthouse Reports, Cathal Mc Daid at Enea, and James Hobson at @hacksmith

00:00 I hacked Linus!
00:59 How Steve Jobs and Steve Wozniak hacked the telephone network
02:22 Early history of the telephone
07:08 The kidnapping of Sheikha Latifa
08:41 How Signalling System No. 7 works
11:03 Why SS7 is vulnerable to hacking
12:15 How hackers gain access to phones
16:17 How I was able to spy on Linus’ phone
18:09 How hackers can intercept text messages
21:04 How your location can be tracked via SS7
29:03 How to protect your phone from hacking

▀▀▀
Special thanks to our Patreon supporters! Join the community to help us keep our videos free, forever: https://ve42.co/PatreonDE

Adam Foreman, Albert Wenger, Anton Ragin, Balkrishna Heroor, Bertrand Serlet, Bill Linder, Blake Byers, Bruce, Burt Humburg, Dave Kircher, David Johnston, Evgeny Skvortsov, Garrett Mueller, Gnare, gpoly, I. H., Jack Cuprill, John H. Austin, Jr., john kiehl, Juan Benet, KeyWestr, Kyi, Lee Redden, Marinus Kuivenhoven, Matthias Wrobel, Meekay, meg noah, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Sam Lutfi, Tj Steyn, TTST, Ubiquity Ventures and wolfee

If you’re looking for a molecular modeling kit, try Snatoms, a kit I invented where the atoms snap together magnetically - https://ve42.co/SnatomsV

▀▀▀
References:
Black, C. (2020). Spy companies using Channel Islands to track phones around the world. The Bureau of Investigative Journalism - https://ve42.co/SpyTBIJ
It is dangerously easy to hack the world’s phones via The Economist - https://ve42.co/EconHack
Blake, H. (2023). The Fugitive Princesses of Dubai. The New Yorker - https://ve42.co/DubaiNY
McDaid, C. (2021). How Surveillance Companies Track You Using Mobile Networks. media.ccc.de - https://ve42.co/McDaid2021
Engel, T. (2014). SS7: Locate. Track. Manipulate. media.ccc.de - https://ve42.co/Engel2014
Nohl, K. (2014). Mobile self-defense. media.ccc.de - https://ve42.co/Nohl2014
How Cell Service Actually Works via WendoverProductions - https://ve42.co/CellWendover
How Telephone Phreaking Worked via The 8-Bit Guy - https://ve42.co/8BitGuy
Transmission Lines: Part 1 An Introduction via TheSiGuy - https://ve42.co/TheSiGuy
The Step-By-Step Switch via AT&T Tech Channel - https://ve42.co/SwitchATNT
Hacking Your Phone via 60 Minutes - https://ve42.co/60minHack
Rosenbaum, R. (1971). Secrets of the Little Blue Box. The Esquire Magazine - https://ve42.co/Rosenbaum1971
Black, C. et. al. (2023). Ghost in the network. Lighthouse Reports - https://ve42.co/Black2023
Kerr, D. (2019). The step-by-step telephone switching system. dougkerr.net - https://ve42.co/Kerr2019
Ecall and 2G/3G Network Obsolescence via PFA Plateforme Automobile - https://ve42.co/PFAAuto2021


Images & Video:
All references can be found here: https://ve42.co/PhoneSpyingImageVideo

▀▀▀
Directed by Henry van Dyck
Written by Henry van Dyck
Edited by Laura Mills
Animated by Fabio Albertelli, Ivy Tello, David Szakaly, and Jakub Misiek
Filmed by Derek Muller and Linus Media Group Team
Additional research by Gabe Strong
Produced by Derek Muller, Henry van Dyck, Rob Beasley Spence, Tori Brittain, Emily Lazard, Luke Lewis, Gregor Čavlović, and Emily Zhang
Thumbnail contributions by Ren Hurley and Peter Sheppard

Additional video/photos supplied by Getty Images and Storyblocks
Music from Epidemic Sound

How does Japan prepare for its devastating earthquakes? With this giant simulator. For a free trial to Shopify go to https://www.shopify.com/veritasium.

If you’re looking for a molecular modeling kit, head to https://ve42.co/SnatomsV to try Snatoms – a kit I invented where the atoms snap together magnetically.

▀▀▀
A massive thank you to everyone at NIED for allowing access to their facility. Massive thanks to Okouchi-san for arranging this shoot.

A huge thank you to Dr. Yohsuke Kawamata for the tour of E-defense and for sharing his deep expertise.

▀▀▀
References:
Nakashima, M., et al. (2018). Experiences, accomplishments, lessons, and challenges of E‐defense. Tests using world's largest shaking table. Japan Architectural Review, 1(1), 4-17. - https://ve42.co/Nakashima
Suganuma, K. (2005). 3-D Full-Scale Earthquake Testing Facility (E-Defense). NISTEP Science & Technology Foresight Center. - https://ve42.co/Suganuma
Ohtani, K., et al. (2004). Construction of E-Defense (3-D full-scale earthquake testing facility). In Thirteenth World Conference on Earthquake Engineering (Vol. 189). - https://ve42.co/Ohtani
Horiuchi, T., et al. (2022). Contributions of E-Defense Shaking Table to Earthquake Engineering and its Future. Journal of Disaster Research, 17(6), 985-999. - https://ve42.co/Horiuchi
Nakamura, I., et al. (2008). E-Defense experiments on full-scale wooden houses. In Proceedings of the 14th World conference on earthquake engineering, Beijing, China (pp. 12-17). - https://ve42.co/Nakamura
Japan: The Next Big Quake. Financial Times. - https://ve42.co/BigQuake


Images & Video:
Kobe earthquake compilation - https://ve42.co/Kobe


▀▀▀
Special thanks to our Patreon supporters:
carrotcypher, Chris Harper, Max Paladino, Balkrishna Heroor, Adam Foreman, Orlando Bassotto, Tj Steyn, meg noah, KeyWestr, TTST, John H. Austin, Jr., john kiehl, Anton Ragin, Diffbot, Gnare, Dave Kircher, Burt Humburg, Blake Byers, Evgeny Skvortsov, Meekay, Bill Linder, Paul Peijzel, Josh Hibschman, Juan Benet, David Johnston, Ubiquity Ventures, Richard Sundvall, Lee Redden, Stephen Wilcox, Marinus Kuivenhoven, Michael Krugman, Sam Lutfi.

▀▀▀
Directed by Will Wood and Petr Lebedev
Written by Will Wood, Petr Lebedev and Derek Muller
Edited by Jack Saxon and Trenton Oliver
Animated by Fabio Albertelli, Ivy Tello, Leigh Williamson, David Szakaly
Filmed by Petr Lebedev, Lui Kimishima and Derek Muller
Produced by Will Wood, Petr Lebedev, Han Evans and Derek Muller
Thumbnail by Ren Hurley

Additional video/photos supplied by Getty Images and NIED (E-defense)
Music from Epidemic Sound

How an unlikely physics paradox controls these counterintuitive structures. Sponsored by Incogni - Use code veritasium at https://incogni.com/veritasium to get an exclusive 60% off.

If you’re looking for a molecular modeling kit, try Snatoms, a kit I invented where the atoms snap together magnetically - https://ve42.co/SnatomsV

Sign up to the Veritasium newsletter for weekly science updates - https://ve42.co/Newsletter

▀▀▀
A huge thank you to Paul Ducarme and Bas Overvelde at AMOLF for showing us around.
Check out their research on counter-snapping structures here - https://ve42.co/CounterSnapping

For more on Braess’s Paradox, check out these great videos by Up and Atom (https://youtu.be/cALezV_Fwi0) and Steve Mould (https://www.youtube.com/watch?v=Cg73j3QYRJc)

▀▀▀
0:00 What happens if you cut this rope?
1:41 The Spring Paradox
4:59 New York’s Perplexing Discovery
6:29 Road Networks and Traffic Flow
8:40 Braess’s Paradox
14:29 Snapping
17:16 This object shrinks when you stretch it

▀▀▀
References:

Ducarme, P., Weber, B., Hecke, M. van, & Johannes. (2025). Exotic mechanical properties enabled by countersnapping instabilities. Proceedings of the National Academy of Sciences - https://ve42.co/CounterSnapping
Braess's Paradox via Wikipedia - https://ve42.co/BraessWiki
Braess, D., Nagurney, A., & Wakolbinger, T. (2005). On a Paradox of Traffic Planning. Transportation Science - https://ve42.co/Braess2005
Schäfer, B., Pesch, T., Manik, D., Gollenstede, J., Lin, G., Beck, H.-P., … Timme, M. (2022). Understanding Braess’ Paradox in power grids. Nature Communications - https://ve42.co/Schafer2022
Kolata, G. (1990). What if They Closed 42d Street and Nobody Noticed? New York Times - https://ve42.co/Kolata1990
Youn, H., Gastner, M. T., & Jeong, H. (2008). Price of Anarchy in Transportation Networks: Efficiency and Optimality Control. Physical Review Letters - https://ve42.co/Youn2008
Nicolaou, Z. G., & Motter, A. E. (2012). Mechanical metamaterials with negative compressibility transitions. Nature Materials - https://ve42.co/Nicolaou2012
Counter-Snapping replication package - https://ve42.co/CSPackage

Images & Video:

Earth Day Festivities via VHS Music Rarities - https://www.youtube.com/watch?v=0awPgHjn2nY
Earth Day Speeches - https://www.youtube.com/watch?v=RMDI3kXpeQ8
1990s New York via NYC Nostalgia - https://www.youtube.com/watch?v=0YaFxTw0VqM
42nd Street Closure via Trainluvr - https://www.youtube.com/watch?v=gELde63Fzio
42nd Street Traffic Operator - https://ve42.co/NYCTraffic
Dietrich Braess via opc.mfo.de - https://ve42.co/BraessOPC
Dietrich Braess via Wikipedia - https://ve42.co/BraessWikiPic
Belt Buckle via Mingda Hardware - https://ve42.co/BeltBuckle

▀▀▀
Special thanks to our Patreon supporters:
Adam Foreman, Albert Wenger, Alex Porter, Alexander Tamas, Anton Ragin, armedtoe, Balkrishna Heroor, Bertrand Serlet, Blake Byers, Bruce, Charles Ian Norman Venn, Dave Kircher, David Johnston, David Tseng, Evgeny Skvortsov, Garrett Mueller, Gnare, gpoly, Jeromy Johnson, Jon Jamison, JT, Juan Benet, Keith England, KeyWestr, Kyi, Lee Redden, Marinus Kuivenhoven, Matthias Wrobel, Meekay, meg noah, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Robert Oliveira, Sam Lutfi, Tj Steyn, TTST, Ubiquity Ventures, and wolfee

▀▀▀
Writers: Gregor Čavlović & Derek Muller
Producer & Director: Gregor Čavlović
Editors: James Stuart & Trenton Oliver
Camera Operators: Sander Mook, Dylan Meanwell, Fabio Albertelli, Casper Mebius & Gregor Čavlović
Animator: Fabio Albertelli
Illustrator: Jakub Misiek
Additional Editor: Peter Nelson & James Horsley
Researchers: Darius Garewal & Gabe Strong
Thumbnail Designers: Ren Hurley & Ben Powell
Production Team: Rob Beasley Spence, Tori Brittain & Matthew Cavanagh
Executive Producers: Derek Muller & Casper Mebius

Additional video/photos supplied by Getty Images, Pond5.
Music from Epidemic Sound

How close are we to having fully autonomous vehicles on the roads? Are they safe? In Chandler, Arizona a fleet of Waymo vehicles are already in operation. Waymo sponsored this video and provided access to their technology and personnel. Check out their safety report here: https://waymo.com/safety/

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References:

Waymo Safety Reports — https://waymo.com/safety/

Driving Statistics — https://ve42.co/DrivingStats

The Real Moral Dilemma of Self-Driving Cars https://ve42.co/SelfDriving

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Special thanks to Patreon supporters:
Alvaro naranjo, Burt Humburg, Blake Byers, Dumky, Mike Tung, Evgeny Skvortsov, Meekay, Ismail Öncü Usta, Paul Peijzel, Crated Comments, Anna, Mac Malkawi, Michael Schneider, Oleksii Leonov, Jim Osmun, Tyson McDowell, Ludovic Robillard, Jim buckmaster, fanime96, Juan Benet, Ruslan Khroma, Robert Blum, Richard Sundvall, Lee Redden, Vincent, Marinus Kuivenhoven, Alfred Wallace, Arjun Chakroborty, Joar Wandborg, Clayton Greenwell, Pindex, Michael Krugman, Cy 'kkm' K'Nelson, Sam Lutfi, Ron Neal

▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
Animation by Fabio Albertelli and Jakub Misiek
Edited by Trenton Oliver
Audio Mix and SFX by Shaun Clifford
Music by Epidemic Sound https://epidemicsound.com
Additional video supplied by Getty Images and Pond 5
Produced by Derek Muller, Emily Zhang and Petr Lebedev

What happens when you shrink robots down to the size of insects? Let’s explore the mind-bending physics behind their superpowers! Engineers get Onshape Professional free up to 6 months: go to https://www.onshape.pro/veritasium to create CAD models and bring your ideas to life.

▀▀▀
00:00 The Problem Of Surface Tension
3:16 How Does A Bee Fly?
7:08 What Powers Something So Small?
8:16 Tiny Muscles
10:36 Pogo Sticks On Mars
11:27 Mini Search Parties
13:29 Swarms Of Spybots
15:55 Penny Sized Combustion Engines
18:40 Science For Science’s Sake

▀▀▀
A massive thank you to Kevin Chen and the Soft and Micro Robotics Laboratory at MIT.
for hosting us and showcasing their incredible robots. Do check out their paper Acrobatics at Insect Scale: https://www.science.org/doi/10.....1126/scirobotics.ad
We’re incredibly grateful to Mechanical Engineering at Cornell and the Harvard Microrobotics Lab for their groundbreaking work that informed much of what we’ve shared here.
Special thanks to Pakpong Chirarattananon and Cameron Aubin for their expertise and insights into mini-robot science.

CORRECTION: The scale bar at 18:19 is wrong. It should be 2cm, not 2mm. Thanks @nicolaszaugg5825 for pointing it out.

▀▀▀
If you’re looking for a molecular modeling kit, try Snatoms, a kit I invented where the atoms snap together magnetically. https://snatoms.com/

Sign up to the Veritasium newsletter for weekly science updates - https://ve42.co/Newsletter

References: https://ve42.co/botsrefs

Video and Image Credits:
Giving bug-like, flying robots a boost by MIT via YouTube - https://ve42.co/FlyingRobots
Leading edge vortex stably attached near the base of a freely flying maple seed Acer pseudo-platanus by Francis Villatoro via YouTube - https://ve42.co/VortexStab
NASA Mars Helicopter Ingenuity Animations by JPLRaw via YouTube - https://ve42.co/IngenuityAnim
Rolls-Royce | SWARM Robots by Rolls Royce via YouTube - https://ve42.co/SWARMRobots
Robot Rescue: Behind The Technology Deployed For Disaster Relief | by NBC News via YouTube - https://ve42.co/RobotRescue
Call to Service: The Final Rescue of 9/11 by 5.11 Tactical via YouTube - https://ve42.co/CallToService
Colony Collapse: The Mystery of the Missing Bees | Retro Report | by NYT via YouTube - https://ve42.co/ColonyCollapse

▀▀▀
Special thanks to our Patreon supporters:
Adam Foreman, Albert Wenger, Alexander Tamas, Anton Ragin, Autodidactic Studios, Bertrand Serlet, Blake Byers, Bruce, Dave Kircher, David Johnston, Evgeny Skvortsov, Farbod Mansorian, Garrett Mueller, Gnare, Greg Scopel, I. H., Juan Benet, KeyWestr, Kyi, Lee Redden, Marinus Kuivenhoven, Matthias Wrobel, Meekay, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Sam Lutfi, Spilmann Reed, TTST, Tj Steyn, Ubiquity Ventures, gpoly, meg noah, wolfee

▀▀▀
Directed by Henry van Dyck
Written by Henry van Dyck
Edited by Nick Lear and Trenton Oliver
Animated by Fabio Albertelli, Jakub Misiek, Emma Wright and Ivy Tello
Filmed by Henry van Dyck, Petr Lebedev and Michael Cimpher
Additional Research by Geeta Thakur and Gabe Strong
Produced by Derek Muller, Henry van Dyck, Rob Beasley Spence, and Tori Brittain
Thumbnail contributions by Ben Powell, Peter Sheppard, Ren Hurley and Henry van Dyck
Additional video/photos supplied by Getty Images and Story blocks
Music from Epidemic Sound

What it's like to see the Earth from orbit.
Special thanks to Col. Chris Hadfield for chatting with me. http://chrishadfield.ca/

Space imagery courtesy of NASA and the ESA
http://eol.jsc.nasa.gov/
http://www.esa.int/spaceinvideos/Videos

Music by Kevin MacLeod "New Frontier" http://incompetech.com
And "Eureka" by Huma-Huma

I got the chance to interview Bill Gates so I asked him: Will Covid-19 be the last pandemic? How does he deal with misinformation and conspiracy theories? And what is the next disaster? The Foundation Letter is here: https://ve42.co/BG21

Special thanks to Patreon supporters:
Ludovic Robillard, jim buckmaster, Robert, fanime96, Marc Forand, Juan Benet, Robert Blum, Grace O'Maille KRON x Arc iOS, Richard Sundvall, Lee Redden, Vincent, Lyvann Ferrusca, Alfred Wallace, Arjun Chakroborty, Joar Wandborg, Clayton Greenwell, Pindex , Michael Krugman, Cy 'kkm' K'Nelson, Sam Lutfi, Ron Neal

Thanks to Petr Lebedev for the thumbnail, early edits and Jonny Hyman for feedback

I bought 10,000 shade balls and tried to swim in them. They appear to act like a non-Newtonian fluid: rigid under high shear stress, but they flow like a liquid under low shear.
All the signed shade balls have now been mailed out - thanks for your support!

Receiving a shade ball:
1. Support Veritasium on any Patreon tier and enter your address https://ve42.co/patreon
2. In about a month I will send out signed shade balls
3. I will cover all shipping costs but if things get really crazy I will prioritize existing Patreon supporters and higher tiers

My sense was that swimming in shade balls would be difficult but still doable. This was roughly true for the single layer of shade balls. The shade balls slide past each other so they act like a liquid, albeit a viscous one owing to their significant inertia. It's much more intense exercise and it's also annoying to be bombarded with shade balls on all sides of your body, particularly your head. With multi-layer shade balls (as exists on much of LA reservoir) things get significantly more difficult. The balls bunch together and when you try to move through them quickly, they become more rigid, providing significant resistance to motion. This has the benefit that you can lie on them and as long as they stay trapped under you, you can float on them. But a little bit of motion causes them to move around and you sink through quickly.

Special thanks to our Patreon supporters! Join this community to help us keep our videos free, forever:
https://ve42.co/PatreonDEB

Huge thanks to:
Jordan Schnabel and Cristian Carretero for filming and swimming and providing lifeguard services.
Raquel Nuno for filming and putting up with me.

Music from https://epidemicsound.com "Dubstep Mammoth 2" "Finally Here (Instrumental)" "The Last Arrival" "Sundown Love (Instrumental)"

Imagine solving a rabies outbreak with chicken heads.

#kurzgesagt
#inanutshell #kurzgesagt_inanutshell #learnwithshorts #science

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We got a bird flu simulator before GTA 6... 🐔

But seriously – why does bird flu spread so quickly and why is it so difficult to contain its spread? Let's look at it together.

#kurzgesagt
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Your teeth might still carry the legacy of nuclear fallout. The story of radioactive baby teeth is a chilling reminder of the dangers of nuclear warfare.

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Did you know whales evolved from dog-sized land animals? Meet Pakicetus, the ancestor that started it all.

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Out in the vast coldness of outer space, there are planets that travel alone through darkness without the boundaries of a system. Here’s how this can happen – and why these frozen deserts might secretly harbor alien life.

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Are wormholes real or are they just magic disguised as physics and maths? And if they are real how do they work and where can we find them?

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Wormholes Explained – Breaking Spacetime

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Somewhere in your body, your immune system just quietly killed one of your own cells, stopping it from becoming cancer, and saving your life. It does that all the time. The vast majority of cancer cells you develop will be killed without you ever noticing. Which is an incredibly hard job because of what cancer cells are: parts of yourself that start to behave as individuals even if it hurts you.

What is cancer and how does your body kill it all the time?

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Let us explore the scientific mystery of what would happen to you, if Earth suddenly turned into gold! The “Midaspocalypse”, based on the ancient tale of King Midas who was cursed so everything he touched turned into gold.


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To get started planning a fulfilling career that does a lot of good, go to https://80000hours.org/inanutshell for your free career guide.

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Fever feels bad. So we take medication to suppress it – but is this a good idea? It turns out fever is one of the oldest defenses against disease.
What exactly is a fever, and how does it make your immune defense stronger? Should you take a pill to combat it?


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CHAPTERS
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0:00 Start
0:23 The Heat of Life
1:58 When Your Blood Turns Into Lava
7:02 Should You Fight Fever With Medications
9:39 80.000h Sponsoring

Be a part of our first Limited Drop, which honors our Cosmic Pioneers and their noble expeditions: https://kgs.link/limited-drop. Stocks are limited – so grab yours before they’re gone for good!

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The universe is magnificent and vast. Hundreds of billions of galaxies, trillions of stars, and even more planets. If even the tiniest fraction are habitable, then the Universe should be teeming with life. And yet we see nothing, only vast emptiness. Where is everyone else?

The answer to this riddle could be as exciting as it is creepy: we are early, born before almost all other life – but very soon this may change. Not only might aliens appear, they could quickly surround us. An irreversible competition for the universe might be about to begin.

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Today we are answering an age-old very scientific and important question: What if the moon crashes into earth? It’s more interesting and weird than you probably think. Let's start with the basics: Why isn't the Moon on its way to crash into us already?

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Life has existed on one planet for about 4 billion years, for all we know. But it might have started right after the Big Bang, when the universe was much stranger and more fantastic than today. A universe that might have allowed life to develop absolutely anywhere. The cosmos might be full of the seeds of life, sleeping in a dead desert, waiting for a few drops of rain to explosively bloom and grow. Tiny and not so tiny aliens might be everywhere.

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Exercising doesn’t help you lose weight. In fact, it barely changes your daily calorie burn.
Welcome to the workout paradox!
Let’s dive into the science of how your body actually handles calories and sabotages your best efforts to burn them.

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CHAPTERS
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0:00 Start
2:10 The Myth of The Workout
5:18 Why Your Body is Sabotaging You
7:47 Why Humans Are so Hungry
10:27 Brilliant Sponsorship
11:58 Curiosity Guide

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Deep in tropical jungles lie floating kingdoms ruled by beautiful and deadly masters: They are sort of the high elves of the ant kingdoms: Talented architects that create castles and city states. But they are also fierce and expansionist warriors and their kingdoms are ensnared in a never ending war for survival. Oecophylla weaver ants.

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Change Your Life – One Tiny Step at a Time
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If you are like most people, there is a gap between the person you are and the person you wish to be. There are little things you think you should do and big things you ought to achieve.
From working out regularly, eating healthy, learning a language, working on your novel, reading more or simply actually doing your hobby instead of browsing reddit.
But it can seem that to achieve your goals, you have to become a different person. Someone who is consistent, puts in more effort, has discipline and willpower. Maybe you have tried your hardest to be like that. And it worked! For a while. Until you find yourself slipping back into your old ways. In the end, you always seem to fail. And with every failed attempt, you become more and more frustrated and annoyed with yourself.
If you believe “success and hustle” internet, it is all your own fault: if you don't succeed, you just didn’t want it enough and the failure is all you. But change is actually hard. But as with most things in life, understanding why makes things easier.


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If you want to help us caption this video, please send subtitles to subtitle@kurzgesagt.org
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