According to a report from USA Today, at least 50 law enforcement agencies have been employing radars that use “radio waves to zero in on movements as slight as human breathing from a distance of more than 50 feet. They can detect whether anyone is inside of a house, where they are and whether they are moving.” (And it can also see that gesture you just made.)

+ Mattathias Schwartz looks at the NSA’s collection of phone records and its connection to actually catching terrorists before they act. “In each of these cases, the authorities were not wanting for data. What they failed to do was appreciate the significance of the data they already had.”