Andromeda, also known as M31 and NGC224 is a spiral galaxy similar to our own but twice as large. It contains about 400 billion stars.

Polytetrafluoroethene, also known as Teflon, is often used as a non-stick coating for pans and other cookware. It's resistance to van der Waals forces means that it is the only known surface to which a gecko cannot stick.

If you yelled for 8 years, 7 months and 6 days, you would have produced just enough sound energy to heat up one cup of coffee.

Viking 1 was launched from the Kennedy Space Center, on August 20, 1975. It went into orbit around Mars on June 19, 1976. The lander touched down on July 20, 1976 on the western slopes of Chryse Planitia (Golden Plains).

Tycho is a relatively young crater, with an estimated age of 108 million years. It is surrounded by a distinctive ray system forming long spokes that reach as long as 1,500 kilometers.

The arc of a rainbow appears as a composition of colors, including red on the outside and violet on the inside.

Alaska is the most earthquake-prone state and one of the most seismically active regions in the world. Alaska experiences a magnitude 7 earthquake almost every year, and a magnitude 8 or greater earthquake on average every 14 years.

The harmless strains of E. coli are part of the normal flora of the gut, and can benefit their hosts by producing vitamin K.

The Carolina Reaper has been certified as the world's hottest chili pepper by Guinness World Records since August 7, 2013. The original crossbreed was between a Ghost pepper (a former world record holder) and a red habanero.

Melanin is also found in hair, the pigmented tissue underlying the iris of the eye, and the stria vascularis of the inner ear.