Bones and muscles -- the musculoskeletal system -- are what make the body move. Learn how every movement of the body is the result of the coordination of bones, muscles, tendons, and ligaments.
How much do you know about the human body?

What makes your knuckles pop?

If you've ever laced your fingers together, turned your palms away from you, bent your fingers back and heard a loud crack or pop, you know what knuckle-popping sounds like. So, what would happen if you popped your knuckles all the time?

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  • Can humans regrow fingers?

    Can humans regrow fingers?

    Can humans regrow fingers? Fetuses can regrow almost anything that gets damaged while in the womb. But can adult humans can regrow fingers? See more »

  • Do babies have kneecaps?

    Do babies have kneecaps?

    Babies have adorable smiles and teeny tiny fingers, but there's a persistent rumor that these new, tiny humans don't have kneecaps. What's the story of a baby's bones? See more »

  • How Bones Work

    How Bones Work

    If you didn't have bones, you'd be puddled on the floor like a jellyfish with skin -- and your ability to impress people on the dancefloor would be severely compromised. What else are skeletons for, besides decorating your house for Halloween? See more »

  • How do broken bones heal?

    How do broken bones heal?

    Unfortunately for him, Humpty Dumpty was not blessed with the human skeletal system. Why can your skeleton do what all the king's horses and all the king's men can't? See more »

  • How does the spine form?

    How does the spine form?

    In a way, your spine is the keystone that holds your body together. Since it has so many important jobs, it has to develop in exactly the right way. How does this happen? See more »

  • How Muscles Work

    How Muscles Work

    Muscles are one of those things that most of us take completely for granted, but they're the body's engine. Without our muscles, we couldn't walk or talk -- and our blood would stop flowing. See more »

  • How Osteogenesis Imperfecta Works

    How Osteogenesis Imperfecta Works

    How could a high-five or a handshake lead to a wrist fracture? People with osteogenesis imperfecta must carefully consider these seemingly innocent actions to prevent broken bones. See more »

  • Top 10 Biggest Bodybuilders

    Top 10 Biggest Bodybuilders

    How does a 97-pound weakling become the World's Most Perfectly Developed Man, as Charles Atlas did? Through the sport known as bodybuilding. Here are 10 of the greatest, most well-known bodybuilders to grace the stage. See more »

  • Top 10 Ways to Protect Your Joints

    Top 10 Ways to Protect Your Joints

    If you still want to be spry after a few decades of birthdays have passed, then sit up straight (literally) and pay attention. We've got 10 tips to keep you in action into your sunset years. See more »

  • What if people had exoskeletons?

    What if people had exoskeletons?

    Exoskeletons normally cover insects, not humans. Why would a human ever want one? Is the possibility of an exoskeleton for humans just around the corner? See more »

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