Many things we use daily were invented for a totally different reason and have a pretty interesting origin.
Bright Side collected 15 well-known things you wouldn’t guess the initial use of.
16. Bumps on cup covers
Usually, there are several cups of drinks waiting for clients in a kitchen, and they’re covered so they don’t cool. To know what’s inside without opening the cups, employees look at these bumps with the name of the drink written on them. This is also convenient for the buyer because you can find your drink among others.