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Saeed Haj

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last 3 solved tasks
How many cigarettes do you see in this picture?
I can kill people, or cause great pain. You eat me. I can mean you're crazy. I hold things together. I help climbers stay safe. I can replace a swear. And I'm on a violin. What am I?
What invention lets you look right through a wall?

Chester F. Carlson

Died 19 Sep 1968 at age 62 (born 8 Feb 1906). Chester Floyd Carlson was an American physicist who invented xerography (22 Oct 1938), an electrostatic dry-copying process that found applications ranging from office copying to reproducing out-of-print books. The process involved sensitizing a photoconductive surface to light by giving it an electrostatic charge Carlson developed it between 1934 and 1938, and initially described it as electrophotography It was immediately protected by Carlson with an impenetrable web of patents, though it was not until 1944 that he was able to obtain funding for further development. In 1947 he sold the commercial rights for his invention to the Haloid Company, a small manufacturer of photographic paper (which later became the Xerox Corporation).

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