What motivates explorers to venture into the unknown? TED hide caption

itoggle caption TED

Friday

"If you live with your head in the clouds every now and then, it helps you keep your feet on the ground." -Gavin Pretor-Pinney Masterfile (Royalty-Free Div.) hide caption

itoggle caption Masterfile (Royalty-Free Div.)

Friday

"If you think of stereotypes as some sort of flaw in our mind, some sort of pathology or cruelty, you won't understand them or know how to combat them" — Paul Bloom iStockPhoto hide caption

itoggle caption iStockPhoto