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The thumb is one of the five fingers on the human hand. Thumbs are different from the other four fingers because they are in a different direction, have only 2 bones (the others have 3), and are shorter. Thumbs allow us to pick things up. This is called having "opposable thumbs". Thumbs have an artery in them. Arteries have a pulse. This is why we should not take other peoples' pulses with our thumbs.