While highly prized for symbolizing good luck, the four-leaves clover is rarely found in nature

A mirage is an atmospheric optical illusion in what an observer sees a nonxistent body of water or an image of some object.

Homo Erectus is the name commonly given into the primate species from which humans are believed to have evolved.

Quasars, faint celestial objects resembling stars, are perhaps the most distant objects know.

The importance of environmental stimuli in the development of coordination between sensory input and motor response varies between species to species

A musical genius, John Cage is noted for his highly unconventional ideas, and he respected for his unusual compositions and performances.

In the 1800s store owners sold everything from a needle to a plow, trust everyone, and never took inventory.

Elected to serve in the United States House of Representatives in 1968, Shirley Chisholm was known for advocacy the interests of the urban poor.

Turquoise, which found in microscopic crystals, is opaque with a waxy luster, varying in color from greenish gray to sky blue.

The dachsund is a hardy, alert dog with a well sense of smell.