In 2013, NASA beamed a copy of the Mona Lisa on the moon using a high-powered laser that was originally used to make communication between spacecraft more effective. The image was sent back to Earth using radio waves.
While some salamanders are born as adults, axolotls never become adults. Instead, they retain their gills for life and have legs that never fully develop, which means they have to stay in the water, earning the name 'walking fish'....
This comes from the Greek myth wherein Eris, the goddess of mischief, threw a golden apple in the middle of the wedding banquet, saying that it was for the most beautiful goddess of all, a title which Hera, Athena...
It is unsure who invented the thermometer but it was once filled with brandy instead of mercury and apparently, was accurate enough.
The white part of your tooth is harder than anything else in your body, even your hardest bone, made up of 96% mineral. In spite of this, though, it still decays when continually exposed to acids and sugars.
The Ancient Egyptians used the frayed ends of wooden twigs for toothbrushes - ouch! - and a mixture of burnt eggshells, ashes, powdered ox hooves and mint as toothpaste.
It was part of a real estate marketing campaign. Only in 1949 was the sign changed to Hollywood as it is today.
It bears the name 'Beren' while his wife's gravestone bears the name 'Luthien'. Beren and Luthien were star-crossed lovers he himself invented.