#652 Why does blood show up under UV light?
Watch on YouTube Why does blood show up under UV light? Because it absorbs all of the light and appears completely black. When we watch crime movies, the police often…
Watch on YouTube Why does blood show up under UV light? Because it absorbs all of the light and appears completely black. When we watch crime movies, the police often…
When were sunglasses invented? The first sunglasses were used by the Inuit people tens of thousands of years ago. The Inuit people lived, and still live, on the Arctic regions…