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Khoi Nguyen

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last 3 solved tasks
Tricky math! Can you solve this? If 11+11=4 and 12+12=9 Then 13+13=?
MATH PUZZLE: Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?

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).

Why parents go grey

The boss of a big company needed to call one of his employees about an urgent problem with one of the main computers. He dialed the employees home phone number and was greeted with a child's whispered, "Hello?"

Feeling put out at the inconvenience of having to talk to a youngster the boss asked, "Is your Daddy home?"

"Yes", whispered the small voice.

"May I talk with him?" the man asked. To the surprise of the boss, the small voice whispered, "No."

Wanting to talk with an adult, the boss asked, "Is your Mommy there?"

"Yes", came the answer.

"May I talk with her?" Again the small voice whispered, "no".

Knowing that it was not likely that a young child would be left home alone, the boss decided he would just leave a message with the person who should be there watching over the child. "Is there any one there besides you?" the boss asked the child.

"Yes" whispered the child, "A policeman".

Wondering what a cop would be doing at his employee's home, the boss asked, "May I speak with the policeman"?

"No, he's busy", whispered the child.

"Busy doing what?, asked the boss.

"Talking to Daddy and Mommy and the Fireman", came the whispered answer.

Growing concerned and even worried as he heard what sounded like a helicopter through the ear piece on the phone the boss asked, "What is that noise?"

"A hello-copper", answered the whispering voice. "What is going on there?", asked the boss, now alarmed. In an awed whispering voice the child answered, "The search team just landed the hello-copper"

Alarmed, concerned and more than just a little frustrated the boss asked, "Why are they there"?

Still whispering, the young voice replied along with a muffled giggle:

"They're looking for me"

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