A type of automotive differential, that allows the driven wheels to spin at different speeds. However, unlike an open differential, an LSD has a mechanism to prevent the driven wheels from spinning too fast in relation to one another. This prevents a slipping wheel from robbing the power from the wheel with traction.

These properties lend themselves well for track driving, off-roading, inclement weather, drifting, and burnouts.

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.

The act of anal sex without lubrication.

Going in dry.