As Waymo deploys more driverless cars to 15 U.S. cities and counting, its vehicles keep encountering new and unexpected situations that they have no script to handle.

Flaming chunks of metal crash into homes, farms and parking lots. Who’s to blame? And who pays for the damage?

You can now buy panels that plug into electrical outlets, but there are some important safety issues to consider when picking and installing a system.

© Patrick Junker for The New York Times

You can now buy panels that plug into electrical outlets, but there are some important safety issues to consider when picking and installing a system.

I didn’t want to have to depend on a weather app to know when the storms are coming.

More light at the day’s end comes at a price: much later winter sunrises across much of the U.S. Scientists have documented consequences for public health and the economy.

Some gun violence experts are skeptical. But the research raises questions of whether there’s a cause-and-effect relationship and if so, what’s behind it.

The Nuclear Regulatory Commission plans to end longstanding guidance that radiation exposure be “as low as reasonably achievable.”

© Audra Melton for The New York Times

The car’s driver-assistance system was in use when the crash killed a woman on Friday, the police said.

The driver told investigators he was using the vehicle’s automated-driver system when the vehicle left the roadway and crashed into a house in Harris County, Texas.

Innovative systems to keep ships from hitting North Atlantic right whales are coming into use. The Trump administration is weighing whether they can replace a bedrock protection.

Innovative systems to keep ships from hitting North Atlantic right whales are coming into use. The Trump administration is weighing whether they can replace a bedrock protection.

© Sophie Park for The New York Times