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    Quiz: Get the Basics on Blood

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    Blood makes up about how much of your body weight?

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    Blood makes up about how much of your body weight?

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    Blood is a specialized body fluid with four main ingredients. Plasma is the liquid part. It makes up a little over half of our blood. It's 92% water. The rest of our blood is made of red and white blood cells and platelets.

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    Just before his death, doctors drained blood from the first president of the United States to try to cure him of illness.

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    Just before his death, doctors drained blood from the first president of the United States to try to cure him of illness.

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    When founding father George Washington came down with a sore throat and had trouble breathing, his doctors took blood from his body. This was a common way to treat ills in those days. In all, they drained about five pints -- about half of his blood -- in less than a day. The president didn't recover.

    When it comes to romance, what question might a person from Japan ask you to see if you're well-matched?

    When it comes to romance, what question might a person from Japan ask you to see if you're well-matched?

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    When a Japanese matchmaker asks, “What’s your type?” she may not mean tall, dark, and handsome, but A, B, O, or AB. Many Japanese believe your blood group says a lot about your personality. Type A blood is a sign you are hard-working, neat, and sensitive. People with type O are thought to be independent, logical self-starters.

    Which type of blood is most attractive to hungry mosquitos?

    Which type of blood is most attractive to hungry mosquitos?

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    People with type O blood are 83% more likely to be bitten by a mosquito. Hospitals ask most for type O blood, too. That's because type O can be given to anyone. O-negative is the most appealing of all.

    Blood tests can tell your doctor if:

    Blood tests can tell your doctor if:

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    For a long time, blood tests have been used to tell if you are sick. Too few red blood cells may mean you have anemia. Too many white ones can be a sign of infection. Now, researchers are finding that certain chemicals in the blood are signs or “markers” that a person may be depressed or even thinking about suicide. These results give hope to better ways to test for, treat, and prevent mental illness.

    Scientific research tells us vampires don't exist.

    Scientific research tells us vampires don't exist.

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    A theory called “geographic progression” shows that if vampires had been around in the year 1600, as rumored, there wouldn’t have been enough blood to go around. As legend goes, vampires don’t just “ vant to suck your blood,” they need it. Every time they kill to stay alive, it’s minus one for humans, plus one for vampires. At that rate, we would have been wiped out in less than 3 years, leaving vampires bloodthirsty.

    Blood clots can form in your legs on a long plane trip because:

    Blood clots can form in your legs on a long plane trip because:

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    Spending long stretches of time without moving your legs can cause “deep-vein thrombosis,” or blood clots in the legs. Flights of 8 hours or longer are the worst. To lower your risk, stand, stretch, and walk a bit when the seat belt sign isn’t lit. Go for roomier exit rows if you have a choice of seats.

    If you have this type of blood, you may have a greater chance of memory loss as you age:

    If you have this type of blood, you may have a greater chance of memory loss as you age:

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    A study shows people with the rarest blood type, AB, are most likely to have thinking and memory problems. If you have type AB blood, you may want to forget about this finding in favor of doing things that can help keep your memory sharp, such as controlling blood pressure, cholesterol, and blood sugar.

    The first blood transfusion was done in the:

    The first blood transfusion was done in the:

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    • Correct Answer:

    A British doctor named William Harvey first discovered the circulation of blood in 1628. Thirty-seven years later, the first known transfusion was done by physician Richard Lower. He treated a sick dog by giving him blood from other dogs. The first human blood transfusion was done by Frenchman Jean Baptiste Denis 2 years later.

    The original meaning of the saying “blood is thicker than water” is that family ties are the tightest of all.

    The original meaning of the saying “blood is thicker than water” is that family ties are the tightest of all.

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    Actually, it’s quite the opposite. In Middle Eastern culture, blood brothers -- warriors who share blood they shed in battle -- are even closer than biological brothers. An earlier expression is that blood is “far stronger than the water of the womb.” Historians think wealthy Englishmen may have bent the meaning to stress the importance of bloodlines and keep money in the family.

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