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Suvo Roy

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MATH PUZZLE: Can you replace the question mark with a number?
There are 4 words hidden in the picture, can you find 1 of 4?

Heinrich Geissler

Born 26 May 1815; died 24 Jan 1879 at age 63.German glassblower for whom the Geissler (mercury) vacuum pump and the Geissler tube are named. With the unprecedented (1/100 mm of mercury) low vacuum he produced in sealed glass tubes, he made available to early physicists a valuable tool to study the effect of electricity on the remaining traces of gases therein. These produced more detailed studies of the structure of matter.[DSB and EB give birth year as 1815, but Chambers Bio. Dict. gives 1814.]

Pun-Dead

Making fun of dead people is a grave mistake!
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