Recognition of other worlds, of other ways of living, of being, of seeing, of thinking-that's regarded as a great moment in the history of our species, as great as leaving the oceans to come up on the land.
What is life, exactly? This is a question that keeps biologists up at night. The science of biology is the study of life, yet scientists can't agree on an absolute definition. What about a computer program that learns and evolves? Can a wild fire -
When scientists first started to classify life, everything was designated as either an animal or a plant. But as new forms of life were discovered, the original classification was not sufficient enough to organize the diversity and complexity of life.