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Calculate the number 3909

NUMBERMANIA: Calculate the number 3909 using numbers [1, 3, 5, 6, 12, 273] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 20

The first user who solved this task is Manguexa Wagle.

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My sister was tellin...

“My sister was telling me about our cousin. I have to say, he sounds familia.”

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Ball point pen

In 1943, Laszlo Biro filed for a British patent (No. 564172) on a practical ball point pen with quick-drying ink. Biro was a journalist, in 1938, in Budapest (also sculptor and hypnotist) when he took out a Hungarian patent for his first design of the pen. In 1940, he escaped the Nazis by going via Paris to Buenos Aires, Argentina. There a British entrpreneur, Henry Martin, saw Biro’s pen and realized its value for air crews making high altitude navigational calculations. It could write blot-free, unaffected by low or changing atmospheric pressure. Martin bought the rights and began small scale production of ballpoint pens for the RAF. In 1945, the Eterpen Co in Buenos Aires began commercial production.«

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