What can go up and come down...
[5327] What can go up and come down... - What can go up and come down without moving? - #brainteasers #riddles - Correct Answers: 32 - The first user who solved this task is Djordje Timotijevic
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What can go up and come down...

What can go up and come down without moving?
Correct answers: 32
The first user who solved this task is Djordje Timotijevic.
#brainteasers #riddles
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April Fool's Day - Here are 5 pranks you can play on people

1. Add food coloring to milk that comes in a cardboard container.
2. Add food coloring to the windshield washer fluid of someone’s car.
3. Switch around random keys on someone’s keyboard who isn’t a very good typist.
4. Switch the Push and Pull signs on a set of doors.
5. Hide food in a trash can and when someone comes by grab some and eat it.
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Edison patent

In 1902, Thomas A. Edison was issued a U.S. patent for a "Reversible Galvanic Battery" (No. 692,507), a design for a permanent battery with a large capacity per unit of weight. Finely divided cadmium is used as the oxidizable element. An oxide of nickel or cobalt is used as the depolarizer, mixed with a flake-like conducting substance such as graphite. According the patent, "the oxid of nickel or cobalt is raised to a superperoxid condition when charged. In discharging the nickel or cobalt oxid will be reduced to a lower state of oxidation, while the metallic cadmium will be oxidized." The active materials are packed under pressure in perforations of a conducting plate. The nickel oxide is preferred as less costly and less soluble in the alkaline electrolyte.
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