When we speak of energy of course we're talking about all kinds of sources. There's oil & gas, solar power, wind power, water power, and these are just a few of the many sources by which energy is created. These days, they're even turning waste into energy. That's right: old tires, railway ties, even garbage itself is being turned into power nowadays. In fact, the city of Oslo runs 90 percent on trash power now.
The word Energy itself comes from the Ancient Greek word: ἐνέργεια meaning“activity, operation." It is believed the word itself was coined by Aristotle in the 4th century BC. In contrast to the modern definition, originally the word was more of a philosophical concept, broad enough even to include such ideas as happiness and pleasure.
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