We all know coffee, energy drinks, and certain sodas contain caffeine. This stimulating substance—which can be natural or synthetic—can show up in many surprising sources, like decaf coffee ...

Renewable energy is energy derived from natural sources that are replenished at a higher rate than they are consumed. Sunlight and wind, for example, are such sources that are constantly being ...

4 min read Geothermal energy has been used for thousands of ... about one-sixth of the carbon dioxide that a relatively clean natural-gas-fueled power plant produces. Binary plants release ...