Breathing Car Exhaust Can Calm You Down (But Can Also Kill You)

Walking along a busy street while taking deep breaths might not sound like a healthy thing to do, and it certainly doesn't sound relaxing. But a new study from Tel Aviv University has found that in fact breathing in a little car exhaust—or carbon monoxide, more specifically—in small doses might actually do you some… »11/13/11 1:05pm11/13/11 1:05pm