Outstandingly bright — with eyes that strikingly resemble ours — yet their ancestors split from mammals and birds 600 million years ago.
Just as vertebrates differ greatly in intelligence and sentience, invertebrates may differ greatly too.
Recent research has created some unexpected ethical problems for the seafood industry.
What about shrimp? Their brains turn out to have memory and learning centers, which has triggered an evolution squabble.
How do you get a 3-D shape from a linear code? That is the puzzle of morphogenesis.