Mystery
The Dancing Plague of 1518
In July 1518 in Strasbourg, a woman began dancing uncontrollably. Within a month, 400 people had joined and several died of exhaustion. No one knows why.
Science
Honey Never Spoils
Archaeologists found 3,000-year-old honey in Egyptian tombs that was still edible. Honey's low moisture and acidic pH make it inhospitable to bacteria.
Science
Octopuses Have Three Hearts
An octopus has three hearts: two pump blood to the gills, while the third pumps it to the body. When swimming, the body-heart stops — which is why octopuses prefer crawling.
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