"X"- - - -Unknown quantity used in math calculations.

"Spurt"- - - -a drip of water under pressure.

"Expert"- - - -an unknown drip under pressure. Good luck with that.

Road draft tubes provided negative pressure in the crankcase at speeds above 30 MPH due to the venturi effect of air flowing past the end of the angle-cut tube sticking down into the airstream under the vehicle. It worked 70 years ago, and it still works today.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!