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What will be the missing number?

Solve this number puzzle. What will be the missing number? (6, 15, 28, 45, ??)

Correct answers: 179

The first user who solved this task is Djordje Timotijevic.

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Mice and Light Bulbs

Q: How many mice does it take to screw in a light bulb?
A: Two, if they're small enough.

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Rocket mail

In 1928, Austrian Friedrich Schmiedl launched his first experimental rocket. The design he first used was not successful. However, by 9 Sep1931, he started the world's first official postal rocket-mail service between two Austrian towns. A parachute provided a safe landing. His rocket-mail service continued until 16 Mar 1933 when laws prohibited the civilian use of explosives (including his rocket fuel.)

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