Quiz: Fun Facts About Your Hands

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  • Question 1/10
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    Which grows faster, your fingernails or your toenails?

  • Answer 1/10

    Which grows faster, your fingernails or your toenails?

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    • Correct Answer:

    Fingernails grow about twice as fast as toenails, at 3.47 millimeters per month compared with 1.62 millimeters per month.

  • Question 1/10
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    Which hand does more of the work when typing?

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    Which hand does more of the work when typing?

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    If you position your hands correctly on the keyboard, your left hand will do 56% of the work.

  • Question 1/10
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    Which finger are you most likely to break?

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    Which finger are you most likely to break?

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    Broken pinkies make up about one-third of all hand fractures in adults. Why? The pinky isn't as protected hanging out there on the end, and the bone is about the width of a pencil.   

  • Question 1/10
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    How many muscles are in each finger?

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    How many muscles are in each finger?

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    Even though most of your body’s moving parts have muscles, your fingers don't. They're moved by muscles in your wrist, palm, and forearm that are attached to tendons, or tough bands of connective tissue, in your fingers.

  • Question 1/10
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    Your fingernails continue to grow after you die.

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    Your fingernails continue to grow after you die.

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    That's a myth, as is the one about hair. Dehydration causes a corpse's skin and soft tissues to shrink, making the nails look longer.

  • Question 1/10
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    Only humans have opposable thumbs.

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    Only humans have opposable thumbs.

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    Most apes and monkeys can touch their thumbs to their other fingers. Opossums have opposable thumbs, too. Still, you can move your thumb farther across your hand than a non-human primate can.

  • Question 1/10
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    What causes a difference in length between your ring and index fingers?

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    What causes a difference in length between your ring and index fingers?

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    • Correct Answer:

    The difference is determined by this sex hormone early on during a baby's growth in the womb. Most men have longer ring fingers, while the opposite is true for many women.

  • Question 1/10
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    Does cracking your knuckles cause arthritis?

  • Answer 1/10

    Does cracking your knuckles cause arthritis?

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    • Correct Answer:

    Crack away! Someone might've fed you this myth because they couldn’t stand the annoying sound. The popping noise you hear isn’t bone on bone -- it’s the bursting of small gas bubbles in the joint. And studies show there's no link between the habit and stiff, painful joints.   

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    What’s the chance that two right-handed parents will have a left-handed child?

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    What’s the chance that two right-handed parents will have a left-handed child?

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    • Correct Answer:

    Scientists think hand preference stems from genetics, hormones, and development. Still, two left-handed parents are the most likely combo to have a left-handed child, with odds of about 30% to 40%.

  • Question 1/10
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    Fingernails have no feeling.

  • Answer 1/10

    Fingernails have no feeling.

    • You answered:
    • Correct Answer:

    Your nails don't have sensation (otherwise you couldn’t trim them without screaming). But your nail bed is packed with nerve endings and blood vessels. That's why a tap on the nail is felt below.

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    We have to hand it to you! You know an amazing amount about the human hand.

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Sources | Reviewed by Neha Pathak, MD on February 28, 2017 Medically Reviewed on February 28, 2017

Reviewed by Neha Pathak, MD on
February 28, 2017

IMAGE PROVIDED BY:

Getty Images

SOURCES:

National Center for Biotechnology Information: “Growth rate of human fingernails and toenails in healthy American young adults.”

National Institute of Environmental Health Services: “Fun Facts and Trivia.”

American Academy of Orthopaedic Surgeons: “Finger Fractures.”

American Academy of Orthopaedic Surgeons: “Flexor Tendon Injuries.”

University of Arkansas for Medical Sciences: “Do a person’s hair and fingernails continue to grow after death?”

National Science Teachers Association: “Thumbs Are Handy Digits.”

University of Florida: “Male-female ring finger proportions tied to sex hormones in embryo; may offer health insights.”

Beth Israel Deaconess Medical Center: “True or False: Cracking Your Knuckles Can Lead to Arthritis.”

The Royal Society Publishing: “Why are some people left-handed? An evolutionary perspective.”

Daniel Laberge: “Human Grooming.”

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