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: 9

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A Birthday Wish

Little Sonia was shouting her prayers. "Please God send me a new doll for my birthday."
Her mother, overhearing this, said, "Don't shout dear, God isn't deaf."
"No, but Grandad is, and he's in the next room," Sonia replied.

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Odd Hassel

Died 11 May 1981 at age 83 (born 17 May 1897).Norwegian physical chemist who shared (with Sir Derek H.R. Barton of Great Britain) the 1969 Nobel Prize for Chemistry for his work in establishing conformational analysis (the study of the 3-D geometric structure of molecules). A ring of six carbon atoms has two conformations - the chair and boat forms. These easily interchange - about a million times in a second at room temperature. One of the conformations is, however, strongly predominant (about 99%). Hassel carried out fundamental investigations on this system and showed how heavy or bulky groups, attached to the carbon atoms, take up their positions relative to the ring and to each other. Such work is of great importance for predicting the mode of reaction of a certain molecule.

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