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 ...

You may take probiotics to help reduce symptoms of certain medical conditions, bolster your immune health, improve depressive symptoms, and even promote weight management or mental wellness. Not ...