BRAIN TEASERS

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Find the right combination

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.

Correct answers: 28

The first user who solved this task is Nílton Corrêa de Sousa.

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Mike Vecchione: Private Detective School

I went online to become a private detective. It was a private detective school online, and I paid online. But then I never heard from them again. I thought to myself, I either got ripped off or this is my first case.

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Elmer McCollum

Born 3 Mar 1879; died 15 Nov 1967 at age 88.American biochemist who originated the letter system of naming vitamins. He discovered vitamins A, B and worked with others on vitamin D. He performed extensive research work in nutrition and growth. He was the first in the U.S. to establish a colony of white rats as laboratory animals to be the subject of his nutrition experiments. In the 1910's, he recognized that a healthy diet required certain fats, and he named the essential component "fat-soluble A," as distinct from another he named "water-soluble B." Although at first he thought each was a single compound, he later showed that they were in fact complexes. He researched how certain minerals were important as nutrients, including calcium, phosphorus, fluorine, manganese and zinc.«

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