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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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I got into a fight w...

“I got into a fight with a snail. It was a real slug-fest.”

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Thomas Milton Rivers

Born 3 Sep 1888; died 12 May 1962 at age 73.American virologist who, as chairman of the virus research committee of the National Foundation for Infantile Paralysis (now the March of Dimes Birth Defects Foundation; 1938-55), organized the long-range research program that led to development of the Salk and Sabin anti-poliomyelitis vaccines. His interest in medical research was awakened while with the Army medical corps (1918). He worked from 1922-55 at the Rockefeller Institute as a bacteriologist, and as its Director (after 1937). Rivers addressed a range of topics relating to some of the most devastating viral diseases, including smallpox, Rift Valley Fever, and epidemic encephalitis. He also discovered the parainfluenzae bacillus and cultivated vaccine virus for human use.

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