“Aliens” is a massive action film. Its predecessor, though, feels like an entirely different film. Other than starring Sigourney Weaver and involving some vile, violent aliens, the James ...

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An octopus's brain is located in its egg-shaped head, called the mantle. But the brain does not have complete control over its body. Each arm contains enough neurons to operate semi-independently ...

Our fascination with alien life took off after Galileo’s new telescope allowed us to look up close at the heavens in the early 17th Century. Dark patches spotted on the Moon were assumed to be ...