The typical cell phone user makes 80 percent of their calls to just four people, and the average Facebook user exchanges most of their messages with only five or six friends.

Apr 8, 2009 · In 2002, bearing her microscope on a microbe that lives in the gut of fish, Bonnie Bassler isolated an elusive molecule called AI-2, which showed not only that almost all bacteria can …

TED Fellow Sean Gourley spoke at TED University 2009 about the mathematics of war — how he and his team of mathematicians, physicists and computer scientists uncovered a strong mathematical …

At TEDU 2009, Erik Hersman presents the remarkable story of Ushahidi, a GoogleMap mashup that allowed Kenyans to report and track violence via cell phone texts following the 2008 elections, and …

In this hilariously lively performance, actress Sarah Jones channels an opinionated elderly Jewish woman, a fast-talking Dominican college student and more, giving TED2009 just a sample of her …

Today, TED.com releases its 500th TEDTalk: perennial favorite Hans Rosling’s latest data-bubble presentation from TED@State. Since April 2007, the TED.com site has selected the best talks and …

In the gallery above, Felix Thorn talks about his instrument, Felix’s Machines — a bank of analog and mechanical instruments wired to two Mac laptops to play a haunting music. It sounds like the singing …

From TEDGlobal’s speaker list of more than 90 — including 18-minute talks, demos and TED U courses — 13 of our scheduled speakers already have TEDTalks online from previous TEDs and partners. …

Yesterday, the TEDBlog caught up with author Mary Roach to discuss her brand new TEDTalk and her latest book, Bonk, that captures the most interesting tidbits on the science of sex throughout history.

In this engaging talk from the EG’08 conference, New York Times tech columnist David Pogue rounds up some handy cell phone tools and services that can boost your productivity and lower your bills …