Jaloni Garner, 9, Markell Jackson, 5, and Taylor Corrine Benton, 6, try to determine if a burning marshmallow is undergoing a physical or chemical reaction May 30 at the 23rd Annual Ron McNair Camp-In at the Pacific Science Center in Seattle. The event which is presented by Blacks in Science (BIS), under the direction and leadership of Dr. Millie Russel gives underprivileged kids and kids of color an opportunity to explore the science center after the public has gone home.