Human footprints in Tanzania

Journalist Kate Wong (and several other people) are tweeting from the American Paleoanthropological Society meeting this week. I love live conference tweets. There's always interesting things to be learned. For instance: George Washington University professor Brian Richmond just told the crowd about a newly discovered site in Engare Sero,Tanzania where hundreds of human footprints were found in volcanic ash dating to 120,000 years ago. The prints appear to belong to ~34 individuals, including women, men, and children. And one set of prints seems to be from a group of 18 people traveling together. You can follow the conference at the #PAS2011 hashtag.