Balance of Nature, or Ecological Balance, the balanced relationship of the plants, animals, and other living organisms that make up a natural community. This equilibrium is maintained by the interaction of the various organisms in a specific area, and by their interaction with nonliving environmental factors. (See Ecology.)
The Freemasons is a secret organization that began in the 1700s and is still in existence today. Who are the Freemasons? And what do they do in their secret meetings?
Every November, the Leonid meteor shower fills the sky with "shooting stars." This year, the shower is expected to peak twice. Learn how Leonid and other meteor showers work.