Tropical fish, like red snapper and grouper, can accumulate one of the most poisonous toxins on Earth. People who eat those fish could get ciguatera, an illness with strange neurological effects, such as painful intercourse. And doctors say there's a chance it spreads through sex.
Methane is both a fuel and a potent greenhouse gas. A study in Science magazine suggests that about 50 percent more methane is leaking into the atmosphere than official estimates suggest. Even so, they conclude that it's better for the environment to switch electricity generation from coal power plants to those that burn methane.
Termites are masters of construction in the insect world, working together to construct complex, sky-scraping homes with neither blueprint nor foreman. Harvard engineers have created 8-inch-long robots that can build in the same way — by sensing their environment, and applying a few rules.
The mysterious Clovis culture, which appeared in North America about 13,000 years ago, appears to be the forerunner of Native Americans throughout the Americas, a study of DNA evidence suggests. Remains from an infant buried more than 12,000 years ago at a Clovis site in modern Montana held the genetic key.
The dinosaurs were killed during the Fifth Extinction — which scientists suspect was caused by an asteroid. Now, we are living through an epoch that many scientists describe as the Sixth Extinction and this time, human activity is the culprit.
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