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LiveScience: Life's Little Mysteries
Explore the daily mysteries of life, a new mystery is solved every day!

Why Do Some Clovers Have Four Leaves? Four-leaf clovers sometimes pop up among the three-leaf kind due to a genetic mutation. What Does the Achilles Tendon Do? A tear to the Achilles' tendon can take months to heal, not something soccer star David Beckham or his fans want to hear. Why Does Daylight Saving Time Begin at 2 a.m.? We turn our clocks forward an hour on Sunday for daylight saving time. Find out why the hand changes at 2 a.m. local time. What Do Kidneys Do? The bean-shaped organs on either side of the spine act like nature's recycling centers. How Does the Iditarod Race Work? Find out what makes sled dogs ultra-athletes. What Is a Blizzard? A blizzard as a storm with considerable falling or blowing snow and winds in excess of 35 mph and visibilities of less than 1/4 mile for at least 3 hours. How Much Sleep Do I Need? How many hours of sleep you need is not known for sure, but scientists have some sleep guidelines. What's the Best Single Food to Eat? There's no good answer to this one, because we humans need a range of nutrients from a variety of foods to be healthy.