A neurologic disease afflicting men who wear jean shorts, often effects of this disease include varous wrinkley tatoos, several inches of butt crack showing at all times, and cut off sleeve plaid shirts. Other, more threatning effects can be alcohalism, loss of teeth, terrible smell of cigarettes and/or chrystal meth, and serious mullet action.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.