Psychology
The Placebo Effect Is Getting Stronger
US clinical trials show the placebo effect has roughly doubled over the past 30 years, especially for pain. Bigger, brighter pills and elaborate rituals amplify it.
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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