I joined the Mammoth Graveyard project in 2002, before I worked for Earthwatch. It's a rare site that you can dig in in air-conditioned comfort. The lead investigator, Dr. Larry Agenbroad, raised money to create a museum over the site. Not only are you shielded from the sun, very important when you're digging in South Dakota in the summer, but there's a constant stream of museum visitors ogling our work and photographing us, no doubt envious of our dusty but priveleged access to mammoth tusks, ribs and molars.