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MAGIC SQUARE: Calculate A-B-C

The aim is to place the some numbers from the list (6, 7, 13, 19, 20, 22, 23, 26, 29) into the empty squares and squares marked with A, B an C. Sum of each row and column should be equal. All the numbers of the magic square must be different. Find values for A, B, and C. Solution is A-B-C.

Correct answers: 3

#brainteasers #math #magicsquare

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Earth's curvature photographed

In 1930, a photograph showing the curvature of the Earth was exhibited in Cleveland, Ohio, at a joint session of the American Association for the Advancement of Science, holding its annual convention, and the Society of Sigma XI. According to the New York Times report, it was the first photograph to show the Earth's curvature. The picture, taken from an airplane flying at 21,000-ft over South America by Capt. Albert W. Stevens of the U.S. Army Air Corps, used super-sensitive panchromatic photographic film to record an image of an area larger than some States. It showed the distant horizon of the pampas over 300 miles ahead as bent slightly downward toward one end. The speaker, Dr. C.E.K. Mees, research director at Eastman Kodak Company said it was taken with a 1/50 sec. exposure.*«[Image: taking photographs from a biplane.]

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