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Calculate the number 693

NUMBERMANIA: Calculate the number 693 using numbers [8, 7, 3, 2, 33, 138] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 33

The first user who solved this task is Sanja Šabović.

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April Fool's Day - Freeze your kid’s morning cereal

Freeze your kid’s morning cereal. Put a bowl of your kid’s favorite cereal and milk in the freezer overnight, then watch in the morning as your unsuspecting kid clanks a spoon against the frozen milk.

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Ejection seat first used

In 1942, the first use of an ejection seat to save a pilot was made. Helmut Schenk, a German test pilot, required its use when his Heinkel He 280 refused to separate from the tow aircraft due to the cable release mechanism icing up. As a precaution, Schenk ejected and landed safely. The tow was being made because the He-280 was powered by two Argus pulse-jets that required a high forward speed to start up. The first ejection seat was made by Heinkel, for the He 280. It was powered by compressed air, and accelerated the pilot upwards at between seven-g and nine-g. The He-280 was the first twin-jet engined aircraft and the first jet aircraft to go beyond prototype stage. The earliest known experiment to produce an airplane ejection seat took place on 12 Dec 1912.[Image: Heinkel He-162 ejection seat.]

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