Printer
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Printer

Today’s printer is a distant cousin to the printing press. A printing press applies pressure to an inked surface resting on a print medium like paper, thereby transferring the ink. Developed by goldsmith Johannes Gutenberg in 1439, the printing press was one of the most influential developments of the second millennium because it began the...

Cell Phone Charger
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Cell Phone Charger

A cell phone is a device that connects one person to another. Cell phones run on power. Because cell phones are portable, they run on power that is stored in a battery. Battery storage amounts depend on the capacity of the battery to store power. Power is supplied to the battery via a cord and...