Washington Photo Blog: Wednesday, Sept. 30, 2009

President Obama looks at brain cells during a tour of an oncology laboratory at the National Institutes of Health in Bethesda, Maryland.
Brooks Kraft / Corbis for TIME

Microscopic View

President Obama looks at brain cells during a tour of an oncology laboratory at the National Institutes of Health in Bethesda, Md.

The Washington photo blog is an intimate look at life inside the Beltway and beyond.