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If you have me, you want to sh...

If you have me, you want to share me. If you share me, you haven't got me. What am I?

Correct answers: 93

The first user who solved this task is Djordje Timotijevic.

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Absolute Rest

"Madam, your husband must have absolute rest."
"Well, Doctor, he won't listen to me."
"A very good beginning, madam, a very good beginning."

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Nicholas Joseph Callan

Born 22 Dec 1799; died 10 Jan 1864 at age 64.Irish physicist who pioneered in electrical science. Heinvented the induction coil (1836) before that of better-known Heinrich Ruhmkorff. Callan's coil was built using a horseshoe shaped iron bar wound with a secondary coil of thin insulated wire under a separate winding of thick insulated wire as the “primary”coil. Each time a battery's current through the “primary”coil was interrupted, a high voltage current was produced in the electrically separate “secondary”coil. By 1837, Callan used a clock mechanism to rock a wire in and out of a small cup of mercury to interrupt the circuit 20 times/sec on a giant induction machine, producing 15-inch sparks (estimated at 600,000 volts).«

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