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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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.)
Amy Purdy - Living Beyond Limits
Amy Purdy talks about the power of imagination. She explains how our lives are not determined by what happens to us, but by the choices we make. Imagination allows us to break down borders, to move beyond our circumstances, to create and constantly progress.
Tierney Thys Swims with the Giant Sunfish
Marine biologist Tierney Thys asks us to step into the water to visit the world of the Mola mola, or giant ocean sunfish. Basking, eating jellyfish and getting massages, this behemoth offers clues to life in the open sea.
Natalie Warne - Anonymous Extraordinaries
Born in an underserved part of downtown Chicago, Natalie and her five siblings had to survive on her mother's humble teacher salary, moving from city to city to find work. No stranger to adversity, Natalie was determined to make something great out of her life.
Optical Illusion: Perspective is Everything
Definition of "illusion": something that deceives by producing a false or misleading impression of reality.