Thanksgiving dinner is the time when many of us say the wrong thing to friends and relatives we haven’t seen for a long time. Are you easily embarrassed? People who AREN’T (certain politicians and actors, for instance) have a smaller region in one part of the brain than the rest of us.
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Humans are here thanks to electricity. Evolutionary biologists have discovered that just about every vertebrate on Earth–including us–descended from an ancient ancestor with the ability to detect electrical fields in water.

500 million years ago, two types of fish diverged. One of them were able to use a mild electrical field in order to detect nearby predators, and those are the ones who survived and evolved–and eventually led to us.
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