Someone that is constantly on the prowl for house music. Usually found in a dark sweaty venue with other hounds, sharing water and youtube videos of yet more house music. A house hound can smell a drop from a mile away, and will usually open with the line "do you like house?!"

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.