Kraken

I'm reading Kraken: The Curious, Exciting, and Slightly Disturbing Science of Squid by Wendy Williams. Learned that cephalopods have blue blood because it's copper-based instead of iron-based like mammalian blood. Is this sort of thing interesting to other people? I am a treasure trove of useless knowledge.

Crossposted at Dreamwidth. Comment here or there, as you will.