Several have asked about Darwin's World, whether it's available elsewhere. It is, under my real name Jack L Knapp. Google if you're interested, and you'll find it. You'll also find that my books have been pirated, bought, resold, and are now being offered around much of the known world!
Ah, well. It's only money, right?
'GraySapien' was supposed to be GraySapient, but at the time the extra letter wasn't allowed! So my nom-de-SOL was the one you've been seeing.
Thanks to all who've written, and FYI I've incorporated almost all of the corrections you've suggested. Amazon's reviewers aren't nearly as helpful!