American officials have become so frustrated with a Mexican drug lord's ability to elude capture that they've started telling jokes about it. Time and again, the U.S. provides Mexican law enforcement with precise intelligence about the safe houses where Joaquin "El Chapo" Guzman, head of the Sinaloa drug cartel, is hiding. And every time the Mexicans raid a house, the man that the U.S. government calls "the most powerful drug trafficker in the world" manages to escape at the last minute through the back door.

The last time your doctor gave you a prescription, it likely came with specific information on the correct and safe dosage to take, determined  from years of clinical trials. But when kids need certain prescription drugs, such as statins, morphine, anesthetic or the asthma drug prednisone, doctors sometimes...

Are we facing the end of new drug discovery?

Has the UN underestimated access to safe drinking water?