What is Charles doing?

From Space.com here:

Editors for Simonyi’s mission Web site reported that the installation of computer hard drives and science experiments have kept the space tourist busy for much of the week.

Simonyi is participating in a lower back muscle study for the European Space Agency (ESA), mapping the station’s radiation environment for the Federal Space Agency and the Hungarian Space Office, and testing high-definition camera components for the Japan Aerospace Exploration Agency.

In addition to those studies, he will also spend some time today collecting samples of microbes living aboard the space station as part of another ESA experiment, as well as stamp and sign a series of personal effects for friends on Earth, according to his mission flight plan.

Simonyi, answering one of the some 1,000 questions submitted to his Web site in recent days, described the views of planet Earth from space.

“The image of Earth is incredibly blue and there is just lots of water. It’s not as round as I thought it would be. Typically we’re looking straight down and we don’t see much curvature, and it moves very fast,” Simonyi said, adding that it is the stunning brightness of the Sun that he’s found most amazing. “It’s only in the theaters that you can see fantastic light like that.”