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How many 1 foot by 1 foot br...

How many 1 foot by 1 foot bricks would it take to complete a building that's 20 feet long on all four sides and 20 feet high?

Correct answers: 21

The first user who solved this task is Djordje Timotijevic.

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I am sorry doctor...

"I'm sorry doctor, I know this is unusual but I seem to have a lettuce stuck in my bottom!"
"Good grief," the doctor replies, "I'd better take a look."
"It's worse than that," the doctor says after the examination. "That's just the tip of the iceberg."

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Frederic Eugene Ives

Died 27 May 1937 at age 81 (born 17 Feb 1856).American photographer and inventor of the halftone process, a method of reproducing photographs on a printing press. Prior to this process, photos and illustrations were reproduced from hand-engraved plates. In this way printers could reproduce line drawings, but not the shades of gray in a photograph because printing presses cannot print gray - only black and white. Ives invented a screen that would convert a photograph into a pattern of tiny dots. Large dots form where the image is dark, and tiny dots where the image is light, thus giving the illusion of shades of gray. In 1881, he was the first to make a three-colour print from halftone blocks. Further inventions in photography and colour printing yielded 70 patents.(Image: 1996 U.S. postage stamp.)

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