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손진환

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MATH PUZZLE: Can you replace the question mark with a number?
Find the next number in this series: 5, 7, 12, 19, 31, 50, ?
Cubes of the same size are stacked in the corner of a room as shown. How many cubes are there?

Airplane loop-the-loop

In 1913, the first airplane in the U.S. to perform a loop-the-loop was piloted by Lincoln Beachey over North Isalnd, San Diego, California. At a level of 1,000 feet, he brought his aircraft up with a swoop and a moment later was flying head downward. He completed the loop at a height of 300 feet. Ten days later he performed a triple loop. Beachey was one of the more colorful characters of early aviation. By 1912, he was a stunt pilot of great repute. His daring acts made him well known in aviation circles. In Chicago, he flew along a string of boxcars first rolling one wheel then the other alternatively along the car roofs as the train was rolling down the tracks. He died in 1915, at age 28, from a crash while performing stunts at the Panama-Pacific Exhibition, Cal.

Snakes don't drink...

“Snakes don't drink coffee because it makes them viperactive.”

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