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What is the father doing now?

The mother is 21 years older than the son, and in 6 years time she will be 5 times as old as the son. What is the father doing now?

Correct answers: 18

The first user who solved this task is Sanja Šabović.

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Christmas sign of the times....

As a little boy climbed onto Santa's lap, Santa asked the usual, "And what would you like for Christmas?" The child stared at him open mouthed and horrified for a minute, then gasped, "Didn't you get my E-mail?"

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Max Mason

Born 26 Oct 1877; died 23 Mar 1961 at age 83.American mathematical physicist, educator, and science administrator. During World War I he invented several devices for submarine detection - several generations of the Navy's "M," or multiple-tube, passive submarine sensors. This apparatus focused sound to ascertain its source. To determine the direction from which the sound came, the operator needed only to seek the maximum output on his earphones by turning a dial. The final device had a range of 3 miles. Mason's special interest and contributions lay in mathematics (differential equations, calculus of variations), physics (electromagnetic theory), invention (acoustical compensators, submarine-detection devices), and the administration of universities and foundations.

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