User:EmetNitzach/Sample page

When you get a glass of water from the faucet it looks clear or colorless. But, water, even pure water, has a slightly blue tint. The blue tint is so subtle that it takes a large amount of water before it is noticeable. Water is blue because its molecules absorb the red portion of the visible light spectrum.

The theoretical maximum luminosity of the sun on earth is 683 lumens / watt.

Edison's light bulb had a luminosity of roughly 6.67 lumens / watt. The modern incandescent bulb has improved 200% and produces 13.33 lumens / watt.

There is a wiki page about Joe Biden here.

I decided to reference the watercolor article again.