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Science of a Pandemic

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"Ah-choo!" Your friend just sneezed into his hand. He wiped his nose on his sleeve. Gross. Then you borrowed his math homework. A couple of days later, you are sneezing and blowing your nose. About half the kids in school are sick. So are a few teachers. Meanwhile, you shared a candy bar with your sister. It wasn't that good anyway. Pretty soon, she started sniffling. It isn't long before everyone in your home is hacking up snot. They introduced their germs to everyone and everything they contacted or sneezed near. And a lot of people got sick. In 1918, someone must have sneezed. And someone was close by. Maybe they were friends, sharing homework. Maybe they shared a candy bar. Whatever happened, the disease that caused that first sneeze spread like a wild fire. And this was no ordinary cold. People who felt good in the morning were dead by the same evening. In about 18 months, about 500 million people around the world got sick. Over 50 million people died from the worst outbreak of flu in known history. There may have been twice as many unreported deaths in some places. The deadly influenza spread so fast that laws were passed to try to stop it. It was illegal in some places to cough, spit, or sneeze in public. People wore masks if they went outside.1 Droplets from a single sneeze can send a tiny microbe all the way across a room. Some microbes can live outside for as long as 48 hours or more. They can hang out on whatever surface they hit. During that time,

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