Noble gas atoms have complete outer valence shell electron configuration. Hydrogen does not.

The only letter that doesn't appear on the Periodic Table of Elements is J.

Lightning strikes produce ozone (O3) through electrical excitation of Oxygen molecules.

The lakes of Titan, Saturn's largest moon, are bodies of liquid ethane and methane.

According to studies, blondes have an average of 146,000 follicles, while brunettes have an average of 100,000 follicles and redheads have the least dense hair, with about 86,000 follicles.

The largest cell in the human body is the female egg and the smallest is the male sperm. While you can't see skin or muscle cells, the ovum is typically a millimeter in diameter, large enough to be seen with the naked eye.

Oxygen gas is colorless, odorless, and tasteless, but the liquid and solid forms are a pale blue color.

When the temperature is around 30 degrees, one inch of liquid precipitation would fall as 10 inches of snow -- assuming the storm is all snow.

Olympus Mons on Mars, the tallest planetary mountain in the Solar System, stands about two and a half times as tall as Mount Everest.

the number of vertebrae in mammals is generally fairly constant. There are almost always seven cervical (neck) vertebrae.