(a) enormous razor-toothed ravening killing machines, (b) insidious deadly organisms much too small to see, (c) countless types of beast which can move faster than us, fly, or otherwise get to food before we do, (d) a rather haphazard trial-and-error body design, (e) natural disasters, ice ages etc, (f) each other, (g) miscellaneous

*applause* you're on form today :)

defeated by a sufficiently determined generalist

THat's so a journal title/nameline :)

I do think the brain is better at just finding a solution than it is at finding the best one. Mostly because finding any kind of solution frees you up to do other things like farm, hunt, pay the rent &c - we're amazingly good jugglers really :)