Hope people liked that one (I do still plan to edit Celebrate too, though some of the same themes are in this one too.) And looking over the series... I swear I'm not *trying* to make all the titles start with C, but I half feel like I should rename 'A Simpler Scratch' 'Cat Scratch' or something...

Humans actually can echolocate:
http://www.smithsonianmag.com/scien...without-using-their-eyes-1916013/?no-ist
http://www.sciencemag.org/news/2014/11/how-blind-people-use-batlike-sonar

And I'm pretty sure the son of one of the researchers working with Kish was managing to teach himself to echolocate with a blindfold =)

The title comes from the two types of clicks used for hunting by Sperm Whales:
https://en.wikipedia.org/wiki/Sperm_whale

Aside to Mike: I'm thinking I should make a consolidated ToC, should I just do it and you can remove the single ones?

Sara "Lieta"