hand sanitizer, mind tranquilizer

To the list of things that don't actually keep you from getting sick--chugging vitamin C, downing homeopathic remedies, using Airborne, staying out of the rain--add hand sanitizer.

To begin, the influenza virus mostly spreads via tiny droplets in the air (for example, from sneezes)—not by dirty hands or surfaces—which limits the role of Purell. It probably wouldn't matter even if flu transferred though hand contact, which is how most cold viruses spread. Though Purell kills them in the lab, hand sanitizers don't stop their spread in the real world. The average child touches his or her mouth and nose every three minutes, and both adults and children come in contact with as many as 30 different objects every minute. Even hospitals can't get staff to use Purell before seeing patients; it's impossible for day care staff, parents, or teachers to wash a child's hands 20 times each hour.

Too bad germs are resistant to the placebo effect.