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Calculate the number 4011

NUMBERMANIA: Calculate the number 4011 using numbers [8, 5, 5, 9, 84, 660] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 1

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Walking with a lantern...

Pappy sees Elmer walking with a lantern and asks, "Where ya going boy?" The son smiled and replied, "I'm a-going courting Peggy-Sue." The Father said, "When I went a-courtin', I didn't need me no dang lantern." "Sure Pa, I know." the boy said. "And look what you got !"

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Mont Cenis tunnel authorized

In 1857, a bill was passed by the Italian parliament authorizing the boring of the Mont Cenis Tunnel 8 miles through the Alps between Modane and Bardonnêche. Two weeks later, the first blast was fired on the Italian side by King Victor Emmanuel. During 1858 with only hand drilling methods only 1,506 feet was excavated, total, from both ends. However, in 1861, French engineer Germain Sommeiller introduced pneumatic drills capable of 200 strokes per minute which increased progress by 3½ times to 5,364 -ft in 1870. A wheeled carriage on rails carried up to nine air-driven perforators that drilled a pattern of holes for blasting the rock face. Compressor plants at each end were water powered. When opened on 17 Sep 1871, this triumph of engineering was the world's first important mountain tunnel.*«[Image top: Mont Cenis Tunnel entrance arch; bottom: Sommeiller Boring Machines.]

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