Dogs act like toddlers when you need help - but cats just watch. Scientists compared 3 groups: pet dogs, cats, and human toddlers in an experiment where a human parent hides and pretends to look for an object. 75% of dogs and children helped. Cats only helped if it was in their personal interest.

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Unconsumed bodies: Pull semantics mean nothing happens until you iterate. No hidden resource retention. If you don't consume a stream, there's no background machinery holding connections open.

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