Big 20: Power Supply
Twenty years ago, if you were working on your desktop PC, you plugged it into an uninterrupted power supply so you would not lose any data. If the electricity went out, you had a few minutes to save your files and turn off your machine. Ten years ago, your laptop already had a battery in it and you did not worry about it until recharging it. Today, you do not even have to connect a cable to the device, just lay it on top of an inductive charger. Solar chargers are the future., but better battery life is still a problem.
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