Fun Fact of the Day: Our retinas contain two types of light sensitive cells, rods and cones. The rods are used to detect light intensity and brightness while the cones are responsible for color vision. We have three types of cones capable of recognizing red, green and blue. These are the primary colors, and combining any two will give us the secondary colors of green, cyan and magenta. All these hues in different combinations and intensities give us the many colors that we know and see every day.
On this Day in History in 1848: Hyperion, moon of Saturn, discovered by Bond (US) & Lassell (England).
Fun Fact of the Day: Hair is 50 percent carbon, 21 percent oxygen, 17 percent nitrogen, 6 percent hydrogen, and 5 percent sulphur.
On this Day in History in 1769: John Harris of Boston, Massachusetts, builds 1st spinet piano.