MasaC asks: Why do fingernails on a chalkboard make us cringe? Few sounds cause humans to cringe more than nails across a chalkboard, a fork scraped on a plate, or a heavy metal chair dragged across a tiled floor.  But what exactly is it about this sort of scraping noise that is so offensive to our brains that many even … Continue reading Why Does the Sound of Fingernails on a Chalkboard or Scraping a Plate Make Us Cringe?