Agents use facial recognition, social media monitoring and other tech tools not only to identify undocumented immigrants but also to track protesters, current and former officials said. By Sheera ...

Water powers our lives. It feeds our crops, keeps factories running, generates electricity, and fills our taps. But until now, no one had a clear, national picture of how much water we're using—and ...

Amanda Smith is a freelance journalist and writer. She reports on culture, society, human interest and technology. Her stories hold a mirror to society, reflecting both its malaise and its beauty.

Sending bitcoin is as easy as choosing the amount to send and deciding where it goes. The exact procedure for doing so will depend on the type of Bitcoin wallet you are using, but the main thing you ...