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A boy is twice as old as his...

A boy is twice as old as his sister, and half as old as their father. In 50 years, his sister will be half as old as their father. How old is the boy now?

Correct answers: 66

The first user who solved this task is Sanja Šabović.

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A drunk driver is stopped for...

A drunk driver is stopped for heading the wrong way on a one-way street.
The police officer asked the driver, "Didn't you see the arrows?"
The drunk responds, "Arrows? I couldn't even see the Indians."

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Daniel Kirkwood

Born 27 Sep 1814; died 11 Jun 1895 at age 80.American astronomer and mathematician who noted in about 1860 that there were several zones of low density in the minor-planet population. These gaps in the distribution of asteroid distances from the Sun are now known as Kirkwood gaps. He explained the gaps as resulting from perturbations by Jupiter. An object that revolved in one of the gaps would be disturbed regularly by the planet's gravitational pull and eventually would be moved to another orbit. Thus gaps appeared in the distribution of asteroids where the orbital period of any small body present would be a simple fraction of that of Jupiter. Kirwood showed that a similar effect accounted for gaps in Saturns rings.

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