Calculate the number 2215
[4620] Calculate the number 2215 - NUMBERMANIA: Calculate the number 2215 using numbers [4, 3, 4, 8, 17, 761] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 15 - The first user who solved this task is Djordje Timotijevic
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Calculate the number 2215

NUMBERMANIA: Calculate the number 2215 using numbers [4, 3, 4, 8, 17, 761] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 15
The first user who solved this task is Djordje Timotijevic.
#brainteasers #math #numbermania
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Last year, when the power mowe...

Last year, when the power mower was broken and wouldn't run, I kept hinting to my husband that he ought to get it fixed, but somehow the message never sank in. Finally I thought of a clever way to make the point.
When my husband arrived home that day, he found me seated in the tall grass, busily snipping away with a tiny pair of sewing scissors.
He watched silently for a short time and then went into the house. He was gone only a few moments when he came out again. He handed me a toothbrush. "When you finish cutting the grass," he said, "you might as well sweep the sidewalks."
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Ernst Abbe

Died 14 Jan 1905 at age 64 (born 23 Jan 1840).German physicist who established a technical and theoretical foundation for the design of optical instruments. The Abbe sine condition enabled designing lenses without spherical aberation's image distortion. He invented the apochromatic lens system (1868), and added the Abbe condenser lens to improve illumination for the microscope (1870). He used homogenous immersion of specimen and microscope objective in cedar oil with matching refractive index to give higher magnification. He invented the Abbe refractometer to measure a refractive index. From 1866, he collaborated with Carl Zeiss to produce high quality optical instruments. He became sole owner of the Zeiss optical works in 1888. From 1878, he also was director of the University of Jena astronomical and meteorological observatories.«
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