Although you might not want to leave your protective gear at home, just know that if you do, drivers will be a lot more scared of hitting you.
Spring is in full swing now, and a number of the straphangers (read: subway riders) in New York City, as well as citizens in other locales, are getting new tubes and tires and dragging their bikes out of storage. Bicycle riding is the skill you reportedly never forget, but there's a raging debate about whether or not you should forget your helmet when you hop on your two-wheeler.
Strange but True: Helmets Attract Cars to Cyclists: Scientific American