i don't think we're necessarily smarter, it depends on your difinition of "smart". people seem to think that smart means good grades in school, or a high ranking profession; but the irony is that it takes a really stupid person to think that makes a person smart. intelligence is resillience, creative problem solving, quick wit - not knowledge. you could have all the knoweledge in the world, but that doesn't mean you could even process it, or offer any insight. animals are much smarter than we give them credit for, but humans definitely stand out among the rest of nature in that they are capable of materialistic thinking.
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