A retired technician from China invented a nifty fly-catching device “based on the principle of how frogs catch flies, using a vacuum to trap them — the bait is a piece of raw fish.” Video after the break.

..he tested the device in Wuhan Steel Mill where flies were not so concentrated and found that 400 to 800 flies were caught daily. He claimed that the device is capable of catching more even reaching the thousands if deployed in flies concentrated areas

[via Spluch]