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How do Fiber Optic Cables Work?

For years, I knew fiber optic cables works by transmitting light (instead of electricity), which travels at speed of light and probably the future of all cables. Well, for those of you who don’t understand the ins and outs of fiber optics, here’s a great demo by the Engineer guy who shows you how light can travel in liquid, similar to how fiber optics work.

via make

Also see Wikipedia:

An optical fiber

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How Do Alkaline Batteries work? [Education]

Think of a battery as a small power plant that converts chemical energy through a reaction into electrical energy. First of all there is the container (1). This is a steel cylinder housing the cell’s ingredients.

Then you insert the positive element of the chemical reaction, which is a mix of finely ground Manganese dioxide mixed with conductors (like Carbon) which carry a naturally occurring electrical charge. This is called the cathode, and it is molded inside the empty wall of the container (2).

A separator paper is inserted to keep the cathode from touching the

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