Strokes

When Merck halted a late-stage study of its potential clot-preventing drug vorapaxar in stroke victims last week, it didn't explain why. Now, the company has confirmed it stopped the study after concerns that the drug increased the risk of bleeding in some patients.

Around 1 million Americans suffer a stroke each year and getting the victim to the hospital quickly is of the utmost importance.How do you know if someone is having a stroke? You could read pamphlets and books on it -- but that would be boring! Instead, watch this way too catchy music video (I...