How much does the average adult human brain weigh?

  • 1lbs
  • 3lbs correct

    The human brain is approximately three pounds. Despite what Aristotle once said, the human brain is not the largest in brain-to-body ratio. In fact, mice brain-to-body ratio is almost the same size as a humans. However, we do beat those pesky rodents out in EQ, (encephalization quotient)! Who has the second largest EQ beneath us? Dolphins!

  • 4.5lbs
  • 6lbs
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