The Moon. The Moon completes an orbit around Earth in about 27.3 days.

Virus. A virus can be 1,000 times smaller than a single bacterium.

Flood. In 1993, the Great Midwest Flood killed 48 people and caused $18 billion in damage.

Erythrocyte. Erythrocytes are responsible for delivering oxygen to body tissues.

Cricket. The higher their surrounding temperature, the faster crickets will chirp.

Pluto. Since being declassified as a planet, Pluto's technical name is "134340".