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I am the tool, for inspiring...

I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go, what am I? Do you know?

Correct answers: 24

The first user who solved this task is Chandu Rajyaguru.

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What Do You Get When ...

What do you get when you cross a Buddhist and a Druid? Someone who worships the tree that is not there.

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Nicholas Joseph Callan

Died 10 Jan 1864 at age 64 (born 22 Dec 1799).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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