Mostly teenagers, illiterate 40 some-things and retards who cannot give you correct change. They usually waste time taking extra long breaks in the staff room and stand around talking on the shop floor, or even on the tills, about who fingered who in the stock room earlier that day.

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.