Condensed from an article by Meredith Melnick in Time magazine

In America, more skin cancers show up on the upper left side of people’s arms than the right side. And It doesn’t matter what color you are. Why? Our left arms are more exposed to sunlight when we are driving.

In countries where people drive on the opposite side of the road, the right arm gets more sun exposure. 

Don’t forget to close your windows, though even some rays can still get through and cause damage, and don’t forget to apply a good sunscreen.

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