**FILE** Toxicologist David Black is shown in a lab of his company, Aegis Sciences Corp., in Nashville, Tenn., on Dec. 9, 2008. (Associated Press)

Photo by: Mark Humphrey

**FILE** Toxicologist David Black is shown in a lab of his company, Aegis Sciences Corp., in Nashville, Tenn., on Dec. 9, 2008. (Associated Press)