Replicating the abilities of the National Oceanic and Atmospheric Administration’s fleet of weather satellites would take time and a lot of money—and expose private companies to a large amount of risk.

After a Chinese export ban, can the US get gallium and germanium from Canada—or will tariffs get in the way?

Torrential rain is expected this week in Los Angeles, which risks producing flash flooding and landslides in areas stripped of vegetation by the recent wildfires.