FILE - In this April 14, 2016 file photo, a drone operated captures videos and still images of an apartment building in Philadelphia. A panel of privacy experts and technology companies organized by the Obama administration has issued guidelines for using drones without being overly intrusive. The suggestions are voluntary, but some business interests involved in the debate hope the guidelines head off tougher regulations that they fear could smother the drone industry in its infancy. (AP Photo/Matt Rourke, File)

How much damage can a drone do?

The federal government is preparing to lay out new rules for flying drones, but officials want to know what kind of danger they pose.

rio anti-doping

Look inside Rio’s anti-doping lab

In the race for Rio to be ready, few final tweaks matter more than in Brazil’s 24-hour anti-doping laboratory for the Olympics.