Except for nuclear and geothermal, all energy we use comes from the sun in one form or another.

Unlike wind and solar, geothermal provides steady energy and can serve as a more cost-effective and less environmentally damaging form of baseload power than fossil fuels or nuclear.

Until 1969, biologists thought mushrooms and other fungi were plants. They’re actually more closely related to animals, but with enough differences that they inhabit their own distinct classification.