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Dejan Đoša Čović

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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.

I was sitting in the waiting r...

I was sitting in the waiting room for my first appointment with a new dentist. I noticed his dds diploma on the wall, which bore his full name. Suddenly, i remembered a tall, handsome, dark-haired boy with the same name had been in my high school class some 30-odd years ago. Could he be the same guy that i had a secret crush on, way back then? Upon seeing him, however, I quickly discarded any such thought. This balding, gray-haired man with the deeply lined face was way too old to have been my classmate. After he examined my teeth, I asked him if he had attended northmont high school.
'Yes. Yes, I did. I'm a thunderbolt,' he gleamed with pride.
When did you graduate?' I asked.
He answered, 'in 1975. Why do you ask?'
You were in my class!', I exclaimed.
He looked at me closely. Then, that ugly, old, bald, wrinkled faced, fat-ass, gray-haired, decrepit son-of-a-bitch asked, 'what did you teach?'
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