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Calculate the number 897

NUMBERMANIA: Calculate the number 897 using numbers [1, 2, 4, 5, 53, 209] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 14
The first user who solved this task is Nílton Corrêa De Sousa.
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Switched Inputs

For a computer programming class, I sat directly across from someone, and our computers were facing away from each other. A few minutes into the class, she got up to leave the room. I reached between our computers and switched the inputs for the keyboards. She came back and started typing and immediately got a distressed look on her face. She called the teacher over and explained that no matter what she typed, nothing would happen.
The teacher tried everything. By this time I was hiding behind my monitor and quaking red-faced. I started to type, "Leave me alone!" They both jumped back, silenced. "Whaa??" the teacher blubbered.
Then I typed, "I said leave me alone!" The kid got really upset. "I didn't do anything to it, I swear!" It was all I could do to keep from laughing out loud. The conversation between them and HAL 2000 went on for an amazing five minutes.
Me: "Don't touch me!"
Her: "I'm sorry, I didn't mean to hit your keys that hard."
Me: "Who do you think you are anyway?!" Etc.
Finally, I couldn't contain myself any longer and fell out of my chair laughing. After they had realised what I had done, they both turned beet red. Funny, I never got more than a C- in that class.
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Johann Jakob Dillenius

Died 2 Apr 1747 (born 1687).German-born English botanist who wrote several descriptive works on plants, with a primary interest in crytogams. In 1721, having been offered work as a botanist with William Sherard, he moved to England, and eventually became Sherardian professor of botany at Oxford University. He described and illustrated plants in the Eltham garden of James Sherard in Kent. A new classification of lower plants he introduced (Historia muscorum, 1741) is still partially in use today.«
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