It's Spyder threaded.
"My goal this year is to prove natural selection on the show. It's gonna take a while, it's gonna be very hard to make it fascinating on film in the context of our narrative structure, but I figure screw it. The sky's the limit. Let's do natural selection. I'm sick of fifty percent of this country thinking creationism is reasonable. It's appalling."I Am Goddam Metal Jesus
Adam Savage of Mythbusters