Most of us have the same kind of body parts in the same places. You have a head and a neck. You have arms, elbows, hands and fingers. You have a chest and a tummy. You have legs, knees ...

Unlike the octopus's arms, which that animal often uses to move ... The cuttlefish has one of the largest brain-to-body size ratios of any invertebrate, perhaps even larger than that of the ...