Older guidelines assigned a grade to concussion severity from 1-3, based on degree of symptoms and other clinical features.

FORBES: Safety Prevails -- In Updated Guidelines To Manage Concussions

Late-stage trials ended in May 2001, and the results were impressive:Of 1, 100 patients injected with Amevive, 40% achieved a 75% reduction in the severity of psoriasis.

FORBES: Skin Deep

The proposal may have gotten an unexpected boost in February when an asteroid exploded over Russia, injuring more than 1, 000 people, causing millions of dollars in damage and sparking fresh concerns about the severity of space threats.

CNN: Forget falling stars: NASA plans to catch an asteroid