Bats are famous for using echolocation to navigate in the dark of night--sending sound into the environment and using the resulting echoes to locate prey and avoid obstacles.
Our sun has gone quiet. Almost too quiet.
Scientists are trying to determine what happens to matter when it is exposed to the immense pressures at the center of gas giant planets and stars. And to help them figure it out, they have hit a tiny sliver of a diamond with the largest laser system on Earth.
If you believe there must be extraterrestrial life somewhere in the immensity of the universe, here's some good news: Top NASA scientists agree with you, and at a panel discussion on Monday, they said they were closer than ever to finding out for sure.
House Speaker John A. Boehner (R-Ohio) said Thursday he doesn't have "as much optimism as I'd like to have" that a bill to address the flood of Central American children crossing into the U.S. will get through the GOP-controlled chamber before the end of the month. "We're working -- trying to find some way to deal with what is a humanitarian crisis at our border," Boehner said. But the intensifying political debate makes it increasingly unlikely Congress will approve emergency funding for the crisis before lawmakers take a monthlong August break. The White House is seeking $3.7 billion to shore up border-related agencies, which have warned...