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How 10 animals evolved their iconic featuresWhy are whales so big? Why are giraffe's necks so long? Here are the origins of 10 iconic features in the animal kingdom.
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Why can't we smell ourselves as well as we smell others?It isn't true that we can't smell ourselves, although we do become habituated to our own scent.
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Are legs more important than arms?Whether arms or legs are more important depends on the species and the environment.
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Invisible barrier that runs through Indonesia finally explained by scientistsResearchers now understand why there is an uneven distribution of animal species on either side of the mysterious boundary, known as the Wallace Line.
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Did the Cambrian explosion really happen?Something unique does seem to have taken place during this time when so many animal groups first appeared, but it's not an open-and-shut case.
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What energy source sparked the evolution of life?Leading theories suggest that the first energy used by life was either from the sun or from geothermal heat and chemistry at the bottom of the ocean.
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Which came first: The chicken or the egg?Most biologists will answer confidently when asked "which came first, the chicken or the egg?" but the answer may depend on what type of egg you're talking about.
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Does evolution ever go backward?In regressive evolution, organisms lose complex features and can appear to evolve "in reverse." But evolution doesn't retrace its steps, experts said.
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Evolution Predictable Everywhere in the Universe, Scientist SaysIf the history of life could be rewound and replayed, many of the same innovations would reappear. What’s that mean for life on other planets?
