Random Facts #63 · 10:20pm Apr 11th, 2017
A bag of water actually can be used to start a fire by magnifying sunlight.
"Black light" is actually just ultraviolet, but our eyes can't see it, hence why it still appears dark.
Tests have shown that blue light has an adverse effect on sleeping habits, which is why some OSs such as iOS (I think) and Windows 10 now have "night modes" that reduce the blue light output by the display.
Fire burns in different colors depending on what the fuel is.
Light travels slower through water than through air.
How does that make fire?
4493861 It essentially acts like a magnifying glass.
4493956
Cool.