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Dejan Đoša Čović

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207. RAJAYOGAN P 16
last 3 solved tasks
MATH PUZZLE: Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?

Xerography

In 1938, xerography was demonstrated by Chester F. Carlson. With his assistant, Otto Kornei, Carlson used a sulphur coating on a zinc plate, vigorously rubbed with a handkerchief to apply an electrostatic charge. A glass slide was prepared using India ink to write "10-22-38 ASTORIA," then laid on the sulphur surface in a darkened room. After illuminating them with a bright incandescent lamp for a few seconds, the slide was removed. When lycopodium powder was sprinkled on the sulphur surface and blown off, there remained a near-perfect image of the writing. Permanent copies were made by transferring the powder images to wax paper and heating the sheets to melt the wax. Xerox is a term coming from "xerography" which means dry writing and is a trademark.

Confuse Traffic Signs

A cop pulls over a carload of nuns.
Cop: "Sister, this is a 65 MPH highway -- why are you going so slow?"
Sister: "Sir, I saw a lot of signs that said 22, not 65."
Cop: "Oh sister, that's not the speed limit, that's the name of the highway you're on!
Sister: Oh! Silly me! Thanks for letting me know. I'll be more careful.
At this point the cop looks in the backseat where the other nuns are shaking and trembling.
Cop: Excuse me, Sister, what's wrong with your friends back there? They're shaking something terrible.
Sister: Oh, we just got off of highway 119.
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