1. There exists a waterfall (Blood Falls) in Antarctica from a water source that has never seen sunlight and is completely devoid of oxygen. It's also extremely rich in iron and sodium. When the water is finally exposed to air as it flows out of the glacier, it rusts, coloring the water blood red making it look like the glacier is bleeding. 2. American school buses are yellow because you see yellow faster than any other color, 1.24 times faster than red in fact.