TIL: Hail cannons are a thing https://en.wikipedia.org/wiki/Hail_cannon https://en.wikipedia.org/wiki/Hail_cannon Although seemingly there is little evidence

TIL: Hail cannons are a thing https://en.wikipedia.org/wiki/Hail_cannon https://en.wikipedia.org/wiki/Hail_cannon Although seemingly there is little evidence that they work, and since they previously used to ring church bells before to stop hail I'm not sure that is a continuation of "doing something". What would be handy is some strong evidence of efficacy.