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In the following circles, th...

In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?

Correct answers: 108

The first user who solved this task is Jakubovski Vladimir.

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What Do You Get When ...

What do you get when you cross a Buddhist and a Druid? Someone who worships the tree that is not there.

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George Engelmann

Died 4 Feb 1884 at age 75 (born 2 Feb 1809).German-American botanist and physician, who varied his career in medical practice with botanical travels. After obtaining his medical degree in Europe, he travelled to the U.S. and eventually settled in St. Louis, Missouri. Among his 100 papers documenting western North American flora, his monograph on the cactus, Monography of North American Cuscutinae (1842), is particularly noteworthy. Engelmann collaborated to incorporate a major botanical collection in the public Shaw's Gardens established by businessman Henry Shaw (1800-89) in St. Louis, which is now the Missouri Botanical Garden. The Engelmann spruce of the Rocky Mountains is named for him.«

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