Jeff Smith, the cartoonist creator of the excellent Bone and the flawed-but-interesting RASL, has made the first "season" of his new prehistoric adventure comic book Tüki Save the Humans available to read for free online. For a gorgeous Friday afternoon when you're stuck indoors, this is about as good as it gets. I especially like that Smith included notes under each page, which helps to demonstrate how much research he's devoted to this project. Go give it a try.