KALWARIA ZEBRZYDOWSKA, Poland (AFP) – In a battle against Poland’s constant smog, scientists are testing out a new “cannon” that uses soundwaves to push toxic particles higher into the atmosphere to allow residents to breathe. Installed on top of a metal container, the experimental device consists of a large upside-down cone that makes a loud sound every six seconds. The aim is to chase the smog from Kalwaria Zebrzydowska, which like many Polish towns and cities […]