Sean Carroll: Distant Time and the Hint of a Multiverse
At TEDxCaltech, cosmologist Sean Carroll attacks -- in an entertaining and thought-provoking tour through the nature of time and the universe -- a deceptively simple question: Why does time exist at all? The potential answers point to a surprising view of the nature of the universe, and our place in it.
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Space Painter
Creation of a distant world.
Hannah Brencher: Love Letters to Strangers
Hannah Brencher's mother always wrote her letters. So when she felt herself bottom into depression after college, she did what felt natural -- she wrote love letters and left them for strangers to find. The act has become a global initiative, The World Needs More Love Letters, which rushes handwritten letters to those in need of a boost.
Jon Ronson: Strange Answers to the Psychopath Test
Is there a definitive line that divides crazy from sane? With a hair-raising delivery, Jon Ronson, author of The Psychopath Test, illuminates the gray areas between the two.
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.
The Skin Gun
A simple idea backed by stem cell research allows victims of severe burns to heal in merely days.