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Trần Triệu Tân

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269. Adam Saville 7
270. Michael Dixon 7
271. Trần Triệu Tân 7
272. Cường Nguyễn 7
273. Himanshu Shekhar 7
last 3 solved tasks
If b9bb7 - b9cbc = ca6 find number abc. Multiple solutions may exist.
In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?
How Many Squares Are There?

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).

My mother says she never holds...

My mother says she never holds grudges but then will blindside you with something that happened years ago.
Last week she said, "You know, you really hurt me on your birthday."
And I was like, "Which birthday was that?"
So she replied, "The first one. You have a really big head, you know."
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