Helder Guimarães: A magical search for a coincidence

Why are babies cute? Why is cake sweet? Philosopher Dan Dennett has answers you wouldn't expect, as he shares evolution's counterintuitive reasoning on cute, sweet and sexy things (plus a new theory from Matthew Hurley on why jokes are funny).

Iranian-American comedian Maz Jobrani takes to the TEDxSummit stage in Doha, Qatar to take on serious issues in the Middle East -- like how many kisses to give when saying “Hi,” and what not to say on an American airplane.

Despite her best efforts, comedian Julia Sweeney is forced to tell a little white lie when her 8-year-old begins learning about frog reproduction -- and starts to ask some very smart questions.

When Colin Stokes’ 3-year-old son caught a glimpse of Star Wars, he was instantly obsessed. But what messages did he absorb from the sci-fi classic? Stokes asks for more movies that send positive messages to boys: that cooperation is heroic, and respecting women is as manly as defeating the villain…

Don't make people pay for music, says Amanda Palmer: Let them. In a passionate talk that begins in her days as a street performer (drop a dollar in the hat for the Eight-Foot Bride!), she examines the new relationship between artist and fan.