Donating money isn’t the only way you can help people. You can also give your blood.  Although approximately 62 percent of Americans are eligible to donate blood, only 3 percent do so each year. But someone needs blood every few seconds in the US. While the average red blood cell transfusion is about three units, a single car accident victim can need up to 100 units of blood. This story was first featured in the Today, Explained newsletter Understand the world with a daily explainer plus the most compelling stories of the day. Sign up here. However, as temperatures dip and the...

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