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Nguyễn Tuấn

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MATH PUZZLE: Can you replace the question mark with a number?

Wilhelm Hisinger

Died 28 Jun 1852 at age 85 (born 23 Dec 1766).Swedish mineralogist who inherited his father's iron works, and pursued science privately. From one of his iron mines at Bastnäs came a mineral of unusually high density. Hisinger distributed samples to several European chemical analysts. After his examination in 1803, Martin Klaproth suspected it held a new element. That year, both Hisinger and Jöns Berzelius isolated the new element. They named it cerium in recognition of Giussepe Piazzi's discovery of the new minor plant, Ceres, two years earlier (1 Jan 1801). In 1806, Hisinger investigated electricity's effect on salt solutions. He contributed to the geological knowledge of his country, and recorded finds of its animal and plant fossils. He also amassed fine rock, mineral and fossil collections, which he eventually gave to the Swedish natural history museum.«

Number Jokes

A man is sent to prison for the first time. At night, the lights in the cell block are turned off, and his cellmate goes over to the bars and yells, "Number twelve!" The whole cell block breaks out laughing. A few minutes later, somebody else in the cell block yells, "Number four!" Again, the whole cell block breaks out laughing.

The new guy asks his cellmate what's going on. "Well," says the older prisoner, "we've all been in this here prison for so long, we all know the same jokes. So we just yell out the number instead of saying the whole joke."

So the new guy walks up to the bars and yells, "Number twenty-nine!" This time the whole cell block rocks with the loudest laughter, prisoners rolling on the floor laughing hysterically.

When the guffaws die down, the bewildered new guy turns to the older prisoner and asks, "How come you guys were laughing so hard this time?"

"Oh," says the older man wiping tears from his eyes, "we'd never heard that one before."

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