Typically the left side of an escalator dedicated to speedy individuals who don't have the time or patience to let the escalator take them where they need to go, therefore, they angrily speed-hop (sometimes taking double steps) up or down the moving staircase and pass everyone on the right side, leaving them with the following possible impressions:

"I'm more important than you; shove it"
"I'm wearing a suit and have places to be"
"Oh shit I'm late I'm late I'm late"
"I have to catch a bus, get out of my way or I'll trip you"

You can use this method to your advantage, but if you fall on your ass and go tumbling down the moving stairs, you're on your own.

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.