Phil Plait: How to Defend Earth From Asteroids
What's six miles wide and can end civilization in an instant? An asteroid - and there are lots of them out there. With humor and great visuals, Phil Plait enthralls the TEDxBoulder audience with all the ways asteroids can kill, and what we must do to avoid them.
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Award-Winning Teen-Age Science in Action
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Caroline Casey: Looking Past Limits
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Lyndelle Palmer Clarke Wanted a Deeper Meaning to Her Life
This video is about Lyndelle Palmer Clarke's pursuit wanted a deeper meaning to her life.
Jane Fonda: Life's Third Act
Within this generation, an extra 30 years have been added to our life expectancy -- and these years aren't just a footnote or a pathology. At TEDxWomen, Jane Fonda asks how we can think about this new phase of our lives.
Alexander Tsiaras: Conception to Birth - Visualized
Image-maker Alexander Tsiaras shares a powerful medical visualization, showing human development from conception to birth and beyond. (Some graphic images.)