Low snowpack in the Colorado River headwaters threatens hydropower production at Glen Canyon Dam, where water levels continue to drop. The low levels also threaten fish. Dam managers plan to bypass ...

It’s pretty easy to take a balloon, fill it up with helium, and send it up in to the upper atmosphere. It’s much harder to keep track of it and recover it when it falls back to Earth. If you’re trying ...

It started the way so many modern car problems do: one tiny warning light and a code that sounded like it came from a robot’s diary. The fix seemed straightforward—replace a sensor, clear the code, ...