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Most viewed
5:26
John Kitching
Who decides how long a second is?
Posted
Jan 2021
4:37
Robert Siddall
These squids can fly... no, really
Posted
Jan 2021
5:20
Lucy Cooke
3 bizarre (and delightful) ancient theories about bird migration
Posted
Dec 2020
4:38
Matteo Fadel
Can you win a game of quantum foosball?
Posted
Dec 2020
6:05
Alex Rosenthal
The world's largest organism
Posted
Dec 2020
15:20
Emily Levesque
A stellar history of modern astronomy
Posted
Dec 2020
5:35
Jeff Dekofsky
The most colorful gemstones on Earth
Posted
Dec 2020
4:06
Eve Gaus and Vanessa Ruiz
Why is pneumonia so dangerous?
Posted
Nov 2020
6:34
Sophie Rose
How COVID-19 human challenge trials work — and why I volunteered
Posted
Nov 2020
7:27
Andrew Pelling
Could we treat spinal cord injuries with asparagus?
Posted
Nov 2020
10:46
Johanna Benesty
What it takes to crush a pandemic
Posted
Nov 2020
4:53
Seena Mathew
How fast is the speed of thought?
Posted
Nov 2020
5:17
Christian Moro
Why do you get a fever when you're sick?
Posted
Nov 2020
5:31
Anees Bahji
How do steroids affect your muscles— and the rest of your body?
Posted
Nov 2020
4:28
David L. Hu
Do larger animals take longer to pee?
Posted
Nov 2020
9:16
Mandë Holford
The power of venom — and how it could one day save your life
Posted
Oct 2020
20:59
Leor Weinberger
Can we create vaccines that mutate and spread?
Posted
Oct 2020
11:24
Thomas Crowther
The global movement to restore nature's biodiversity
Posted
Oct 2020
1h 4m
Hosted by Chris Hemsworth and Priyanka Chopra Jonas
Countdown Session 5: Action (Full session)
Posted
Oct 2020
1h 7m
Hosted by Prajakta Koli and Hannah Stocking
Countdown Session 4: Transformation (Full session)
Posted
Oct 2020
1h 7m
Hosted by Jane Fonda and Xiye Bastida
Countdown Session 3: Transformation (Full session)
Posted
Oct 2020
1h 9m
Hosted by Al Gore and Jaden Smith
Countdown Session 2: Leadership (Full session)
Posted
Oct 2020
1h 8m
Hosted by Mark Ruffalo and Don Cheadle
Countdown Session 1: Urgency (Full session)
Posted
Oct 2020
7:34
Johan Rockström
10 years to transform the future of humanity — or destabilize the planet
Posted
Oct 2020
1:19
Kristen Bell + Giant Ant
Why act now?
Posted
Oct 2020
4:26
Karen Scrivener
A concrete idea to reduce carbon emissions
Posted
Oct 2020
1:19
Kristen Bell + Giant Ant
Where does all the carbon we release go?
Posted
Oct 2020
1:06
Kristen Bell + Giant Ant
Why is 1.5 degrees such a big deal?
Posted
Oct 2020
4:43
Climate Action Tracker
The state of the climate crisis
Posted
Oct 2020
1:09
Kristen Bell + Giant Ant
What is net-zero?
Posted
Oct 2020
1:13
Kristen Bell + Giant Ant
Why is the world warming up?
Posted
Oct 2020
12:51
Gokul Upadhyayula
The life unfolding inside your cells, revealed in 3D
Posted
Oct 2020
5:25
TED-Ed
The surprising effects of pregnancy
Posted
Oct 2020
14:09
Frederick Streeter Barrett
The neuroscience of psychedelic drugs, music and nostalgia
Posted
Oct 2020
5:25
Laurence Hurst
Is human evolution speeding up or slowing down?
Posted
Sep 2020
4:57
Daniel L. Schacter
Are all of your memories real?
Posted
Sep 2020
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