The Bucket

When you lower a bucket into the ocean, from a pier or off the side of a ship, it may well seem to come up containing nothing but clear water. But scientists now know that every teaspoonful of that water can contain a hundred million tiny viruses. They differ radically in size, shape, and DNA blueprint — so much so that totally novel DNA keeps being discovered, with implications for anything from anti-aging creams to anti-cancer drugs and evolutionary science.