A drone around double the size of a fly.
Until now such miniature drones were unable to carry the battery needed to power them. Not any more! Unleash the miniature drones that are too small to spot.
It early days though. The power comes from a laser beam, so when the photo-voltaic cell is can not be hit by the beam, the power stops. A new form of energy will be needed for them to be truly useful.
Interestingly they use wings instead of rotors.
Story:
https://www.washington.edu/news/2018/05/15/robofly/