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It's almost Thanksgiving, and that means it's time to eat — and time to nap. You may have heard that turkey is to blame for your post-Thanksgiving sleepiness. But although turkey does contain a chemical that makes humans want to curl up in bed, you can't blame your sluggishness on the bird. Stuffing is the more likely culprit.

AUSTIN — Flooding from Harvey may have focused attention on water quality, but experts say that some Texans were drinking contaminants long before the tropical storm hit treatment plants.

While the famous Antarctic "ozone hole" is finally beginning to heal, 30 years after it was first discovered, scientists have just identified a new threat to its recovery. A study, just out Tuesday in the journal Nature Communications, suggests that a common industrial chemical called dichloromethane — which has the power to destroy ozone — has doubled in the atmosphere over the last 10 years. And if its concentrations keep growing, scientists say, it could delay the Antarcticozone layer's return to normal by up to 30 years.