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What if cracks in concrete could fix themselves? – Congrui Jin
Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/what-if-cracks-in-concrete-could-fix-themselves-congrui-jin Concrete is the most widely used construction material in the world. It can be found in swathes of city pavements, bridges that span...
Why can’t some birds fly? – Gillian Gibb
Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/why-can-t-some-birds-fly-gillian-gibb Though the common ancestor of all modern birds could fly, many different bird species have independently lost their flight. Flight can have incredible...
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