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: 71

The first user who solved this task is Sanja Šabović.

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Eiffel Tower jokes

It is Eiffel Tower Day today! The day marks the completion of the Eiffel Tower on this day in 1889!

I Tried To Climb The Eiffel Tower Once
But eiffel!

What do you call a tourist visiting the Eiffel Tower?
PariSites.

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William N. Lipscomb Jr.

Died 14 Apr 2011 at age 91 (born 9 Dec 1919).William Nunn Lipscomb was an American physical chemist who won the Nobel Prize for Chemistry in 1976 for his research on the structure of boranes (boron hydride compounds), work which also answered general questions about chemical bonding. Boranes became important in chemical research in the 1940s and ‘50s because of the need to find volatile uranium compounds (borohydrides) for isotope separation, as well as the need to develop high-energy fuels for rockets and jet aircraft. To map the molecular structures of boranes, Lipscomb also developed x-ray techniques that later found application in many other areas of chemical research. Lipscomb's research interests included the relationship of three-dimensional structure and mechanisms of enzymes and other proteins.

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