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How Many Regular Hexagons?

How many regular hexagons can you count in this image?

Correct answers: 144

The first user who solved this task is Djordje Timotijevic.

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Skydiving

The skydiving instructor was going through the question and answer period with his new students when one of them asked the usual question always asked: "If our chute doesn't open; and the reserve doesn't open, how long would we have till we hit the ground?"

The jump master looked at him and in perfect deadpan answered: "The rest of your life."

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Heinrich Barkhausen

Born 2 Dec 1881; died 20 Feb 1956 at age 74.Heinrich Georg Barkhausen was a German physicist who discovered the Barkhausen effect (1919), a principle concerning changes in the magnetic properties of metal. His work in acoustics and magnetism led to the discovery that magnetization affects whole domains of a ferromagnetic material, rather than individual atoms alone. He discovered that a slow, smooth increase of a magnetic field applied to a piece of ferromagnetic material, such as iron, causes it to become magnetized, not continuously but in minute steps. With Karl Kurz, he developed the Barkhausen- Kurz oscillator (1920) for ultrahigh frequencies (forerunner of the microwave tube), leading to understanding of the principle of velocity modulation. He is also known for experiments on shortwave radio transmissions.

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