They’re ice cubes! Well done if your guess was correct!
DID YOU KNOW?
In 1844, American physician, John Gorrie, built a refrigerator to make ice to cool the air for his yellow fever patients. Some historians think that Doctor Gorrie may have also invented the first ice cube tray since it was documented that his patients were also receiving iced drinks.
What do you think it is? Let us know in the comments below.