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: 20

The first user who solved this task is Nasrin 24 T.

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When I watch the news I get pa...

When I watch the news I get paranoid. I CNNemy.

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Columbium

In 1801, Charles Hatchett announced to the Royal Society in London that he had discovered a new element, which he named columbium (Cb). In 1801, while working for the British Museum in London he analyzed a piece of columbite, a black mineral from New England, found by JohnWinthrop (1606-1676), the first governor of Connecticut, a mineral collector. His grandson sent the specimen decades before to Sir Hans Sloane, who gave it to the museum. Columbite turned out to be a very complex mineral but Hachett discovered that it contained a “new earth”which implied the existence of a new element which he could detect, but not isolate. Rediscovered 40 years by German chemist, Heinrich Rose, it is now called niobium.«

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