Mark Abdelmalekm. d.

You might think a cup of coffee or a quick walk before heading to your job will cover up your exhaustion from long working hours and little sleep. That is, until your co-worker outs you by saying, "You sound tired." Although it's a common phrase used to describe someone who might sound lethargic, many researchers say a closer look into how someone sounds can reveal how dangerous a sleep-deprived person might be.

Ask Caleb Seymour, 8, of Holden, Maine, to name all the New England Patriot NFL players, and chances are he'll spout them out one by one. Caleb channels the players through his love of all things Patriots and all things football. But perhaps nothing put Caleb more in sync with the football players than when he took a bad hit playing tackle football two months ago and tore his anterior crucial ligament, or ACL, the stabilizing ligament located in the knee.

Traumatic brain injury, also called TBI, has become the signature injury of the war in Iraq -- an alarming realization, given that many doctors feel effective treatment for brain injury is currently lacking. But doctors at Emory University are hopeful that they may have uncovered the next revolution in TBI treatment.