Interesting fact:

Nowadays, it’s rather a strain on the eyes to behold: the permanent wave! This hairstyle was very popular among women until well into the 1990s. German hairdresser, Karl Ludwig Nessler, invented the perm as early as 1905. It took some time to catch on, though, which might have something to do with the fact Nessler’s method involved a lot of cow urine…