What is the etymology of “echinoderm”?
The name echinoderm is from Ancient Greek ἐχῖνος (ekhînos) ‘hedgehog’ and δέρμα (dérma) ‘skin’.
WHY FIVE? Mysteries in Symmetry! (A deep dive into the topic on the ‘echinoblog’
http://echinoblog.blogspot.com/2015/05/why-five-mysteries-in-symmetry.html
