The five worst sounds in the universe, as proven by science

Following up that screeching sound of horribleness that is a knife scraping a bottle is something similar, a fork on glass. Ouch! Beyond that we have chalk on a blackboard in third and a ruler on a bottle in fourth. Fingernails on a blackboard is fifth.

But all the noises have one thing in common: the sounds falls within the frequency range of 2,000 to 5,000 Hz, the same range that includes human screams. Our brains don’t like that much.