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No wonder the brain needs so much energy. The same coordinated activity that allows you to retrieve a specific memory, like what you had for breakfast, continues at rest and even during sleep.

Why and when tickling makes us laugh is still mysterious. But researchers who studied what happens in rat brains when they're tickled say they emit ultrasonic giggles, too — when in the mood for fun.

Employers added 211,000 jobs to payrolls last month, setting the stage for a Federal Reserve interest rate increase later this month.

For many, the alligator is the face of the Florida Everglades. But the reptiles are shrinking in size and population, a signal that the watershed might not be doing as well as it should.

Germany's Bayer corporation says Monsanto is worth $62 billion. That works out to a 37 percent premium over Monsanto's stock price from a few days ago. Bayer is sending a signal it is serious about taking over Monsanto, and it's willing to take on a lot of debt in order to do so.

Egypt's president says the submarine is heading to the area where the plane went down on Thursday. He cautions that determining what caused the crash could take "a lot of time."

The Schiaparelli lander detached from its mothership, the Trace Gas Orbiter, on Sunday. It's expected to make a controlled landing on the Red Planet on Wednesday.

In raising objections to states' Electoral College certifications, many congressional Republicans are likely to cite a number of debunked conspiracy theories that President Trump has been pushing.

India's mission control lost contact with its Vikram lander as it tried to make a soft landing near the moon's remote South Pole. Now the craft has been located, but its condition is unknown.

Scientists and engineers are troubleshooting from 14 billion miles away, with a delay of 20-plus hours each way — trying to fix an antenna control system built 45 years ago.