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I can fly but I have no wing...

I can fly but I have no wings , I can cry but I have no eyes and wherever I go darkness follows me. What am I?

Correct answers: 65

The first user who solved this task is Snezana Milanovic.

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Deciding what Christ...

“Deciding what Christmas gifts to give makes one present tense.”

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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.

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