Why do women have periods?
View full lesson: http://ed.ted.com/lessons/why-do-women-have-periods A handful of species on Earth share a seemingly mysterious tra...
Videos & TV
- Sort by: Title
Why do your knuckles pop? – Eleanor Nelsen
View full lesson: http://ed.ted.com/lessons/why-do-your-knuckles-pop-eleanor-nelsen Some people love the feeling of cracking their k...
Why does ice float in water? – George Zaidan and Charles Morton
View full lesson: http://ed.ted.com/lessons/why-does-ice-float-in-water-george-zaidan-and-charles-morton Water is a special substanc...
Why doesn’t anything stick to Teflon? – Ashwini Bharathula
View full lesson: http://ed.ted.com/lessons/why-doesn-t-anything-stick-to-teflon-ashwini-bharathula Teflon was in the spacesuits the...
Why doesn’t the Leaning Tower of Pisa fall over? – Alex Gendler
Dig into the 800 year history and architecture of the Leaning Tower of Pisa and find out what gives the tower its infamous tilt. ...
Why domestic violence victims don’t leave – Leslie Morgan Steiner
Leslie Morgan Steiner was in “crazy love” — that is, madly in love with a man who routinely abused her and threate...
Why don’t oil and water mix? – John Pollard
View full lesson: http://ed.ted.com/lessons/why-don-t-oil-and-water-mix-john-pollard Salt dissolves in water; oil does not. But why?...
Why don’t perpetual motion machines ever work? – Netta Schramm
Check out our Patreon page: https://www.patreon.com/teded View full lesson: http://ed.ted.com/lessons/why-don-t-perpetual-motion-mac...
Why elephants never forget – Alex Gendler
View full lesson: http://ed.ted.com/lessons/why-elephants-never-forget-alex-gendler It’s a common saying that elephants never forget...
Why extremophiles bode well for life beyond Earth – Louisa Preston
View full lesson: http://ed.ted.com/lessons/why-extremophiles-bode-well-for-life-beyond-earth-louisa-preston Life on Earth requires...