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The U.S. military is closing a facility scientists have used to study the edge of Earth's atmosphere. Conspiracy theorists suspect it's also been used for nefarious activity — like mind control.

Strokes come in two varieties, and drugs that treat one type can be deadly for the other. An experimental device could help get the right treatment to patients while they're still in ambulances.

Space navigation is tricky. There's no up or down, no left or right, and no road signs. This device uses stars to help determine if a spacecraft is off course. It takes nifty pictures, too.

Fed Chair Janet Yellen says that although job growth is rebounding, she sees no inflation threat and no hurry to raise rates. The Fed is not likely to do so before the presidential election.

Positive train control technology was installed but not activated on the track where a deadly derailment occurred on Monday. The technology was still being tested and set to be turned on next year.

Apple reported record sales in its most recent quarter on strong demand for iPhones and App Store purchases. But Apple could face trouble if the trade war with China escalates.

In a Swedish castle, Houthi rebels will meet for peace talks with the government they chased out of the nation's capital in 2015. Expectations for the talks are low but they're seen as a start.

Stock investors have to decide if the August downturn is just part of a normal zigzag pattern in any bull market, or the start of a bear market that could last for years.

Two large radio telescopes have detected very brief, powerful bursts of radio waves, and so far, scientists have no idea what's causing them.

Scientists call them "fast radio bursts," or FRBs: mysterious pulses of radio waves coming from far, far away. Researchers in Australia say they've observed one in real time.