Spring has sprung, temperatures have warmed, and plants and animals have revived again after another winter. This all happens without human direction. No one tells the grass that now is the time to green up, or that trees should sprout leaves, or that pheasants should produce chicks. We call it Mother Nature’s invisible hand. The ancient Greeks had their own myth, that Hades forced Persephone, Zeus’s daughter, to live in the Underworld for six months every year, and then he released her in the spring.
Earth is unique in the solar system. It is alive. Life exists here, but no one life form is p...
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