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Can't Sleep? Study Finds One Short Activity May Help Save Your Memory

After a sleepless night, a surprisingly simple step may help preserve memory—but researchers say it’s no replacement for sleep.

  • Brief 20-minute workout or 90-minute nap improves memory after 30 hours awake
  • Exercise and napping both boost memory, but in different ways
  • Exercise benefits memory without increasing fatigue

Egypt's deserts were once home to a diverse shark community

During the Late Cretaceous period, parts of Egypt were covered in water. A new study, published in the journal Cretaceous Research, describes new evidence that this tropical sea was home to a diverse community of sharks. The study adds five new species to the region's history, found in what the authors refer to as a "shark graveyard."

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