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Which number should replace the question mark?

FUNNY MATH: Which number should replace the question mark?

Correct answers: 100

The first user who solved this task is Slobodan Strelac.

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Late Again

Teacher: "Why are you late this morning?"
Student: "Its my alarm clock. Everyone got up except me!"
Teacher: How did the alarm clock make you the only one not to get up?"
Student: "There are eight of us in the my family and the alarm clock was only set for seven."

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Giovanni Virginio Schiaparelli

Died 4 Jul 1910 at age 75 (born 14 Mar 1835).Italian astronomer who is remembered for his observations of Mars over seven oppositions and named the "seas" and "continents". In 1877, he saw on the surface of the planet Mars the markings that he called canali (channels), later misinterpreted as "canals." He made extensive studies, both observational and theoretical, of comets, determining from the shapes of their tails that there was a repulsive force from the sun. He showed that meteor swarms travel through space in cometary orbits. He explained the regular meteor showers as the result of the dissolution of comets and proved it for the Perseids. He suggested that Mercury and Venus rotate on their axes, discovered the asteroid Hesperia (1861) and was a major observer of double stars.

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