TED: Ideas worth spreading After listening to that one talk, I am now completely and utterly in love with this site.

Emily Oster: What do we really know about the spread of AIDS? Everything we know about the epidemiology of HIV is wrong.

Emily Oster: What do we really know about the spread of AIDS? Everything we know about the epidemiology of HIV is wrong.

An essay about the original Live Aid concert that brings up a lot of valuable questions.

An essay about the original Live Aid concert that brings up a lot of valuable questions.

An essay about the original Live Aid concert that brings up a lot of valuable questions.

Mobile Phones in Fundraising Campaigns