A lot of people get very upset about doping in sport. They may well have a point — but maybe a little scientific perspective is required. Randal Monroe puts the issue well in the alt text of today's XKCD cartoon: Read More >>

You might have a friend who has to take them for asthma. You might know someone else who denies taking them but has gotten crazy ripped really fast and angers easily. Famous athletes are denying or being caught with them in their blood stream seemingly every day—just yesterday, baseball slugger Ryan Braun successfully appealed a positive test for them. Read More >>