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MATH PUZZLE: Can you replace...

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

Correct answers: 158

The first user who solved this task is Allen Wager.

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Missed it

A busload of tourists arrives at Runnymede, just west of central London.

They gather around the guide who says: “This is the spot where the barons forced King John to sign the Magna Carta."

A guy at the front of the crowd asks: "When did that happen?”

“1215,” answers the guide.

The man looks at his watch and says: “Damn! Missed it by a half hour.”

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Edward Troughton

Died 12 Jun 1835 (born Oct 1753).English scientist and instrument maker. Troughton soon established himself as the leading maker of instruments in England. Not only did he make great improvements in the design of existing instruments, but he also invented many new instruments. He began his instrument making career with instruments to aid navigation, for example, he designed the 'pillar' sextant, patented in 1788, the dip sector, the marine barometer and the reflecting circle built in 1796. Other instruments which he designed were for use in surveying. He designed the pyrometer, the mountain barometer and the large surveying theodolites. His famous instruments were astronomical ones. He made the Groombridge Transit Circle in 1805 and a six foot Mural Transit Circle in 1810 which was erected at the Observatory in Greenwich in 1812.

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