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Shu Bi

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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.
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.

Karl Karlovich Klaus

Born 23 Jan 1796; died 24 Mar 1864 at age 68.Russian chemist and biologist whowas born and died in Russia, but wasof German origin, so is also known as Carl Ernst Claus. He discovered ruthenium (1844), which was the last dense, inert, platinum-like metal to be found. He earned degrees in chemistry, then a Ph.D. in pharmacy, but Klaus gained an international reputation for his researches on the platinum metals (osmium, palladium, iridium, and rhodium). His discovery of ruthenium resulted from an analysis of the waste residues of the platinum refinery in St. Petersburg. He named the element from Ruthenia, the Latin name for Russia. Klaus also investigated flora and fauna of Volga steppes.

Light and hard

Q: What's the difference between light and hard?

A: You can sleep with a light on.

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