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I can run swiftly and silent...

I can run swiftly and silently when you want me to stay still, I can move slowly and cautiously and am yours to fill. You look at me often and yet you always forget me, I am the most feared killer, yet you can't live without me. Sometimes you have me for all to spare, Yet when you need me, I am not there. You can waste me, or cherish me, you choose the track, But once you're done you can never get me back. What is it?

Correct answers: 20

The first user who solved this task is Djordje Timotijevic.

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Animal Lives

Q: What has more lives than a cat?
A: A frog -- it croaks every night.

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Edison patent

In 1888, Thomas A. Edision, with co-inventor Ezra T. Gilliland were granted a patent for "Railway Signaling" (U.S. No. 384,830). The invention related to signalling systems for communicating between stations and moving trains by induction from the telegraph wires to the roofs of the cars. In such a system, transmitters were vibrators operated by keys to send signals upon the line, and receivers were telephone receivers connected to the ground. The patent was for an innovation to increase the quickness, rapidity and clearness of the vibrations. By making the transmitted vibrations as short and distinct as possible, they may be more clearly reproduced at the receiver.

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