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.

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 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.