The engine then acts like a wireless access point, spraying water--or data--wherever it's needed.

FORBES: Think You're Wireless? Think Again

It is possible that there is a ring of steel just out of shot, but it seems that the students only close in on the police after the pepper spraying, rather than before, and then pull back voluntarily to allow the officers to reach the safety of their support.

FORBES: PR and Pepper Spray: What the 99% Can Teach Companies

This involves shredding all of an organism's genetic material into pieces in one go by spraying it through a fine nozzle, and then sequencing the pieces without knowing where they came from.

ECONOMIST: Fruit-fly genetics