New Scientist magazine recently ran a long article called Cosmic Accidents: 10 Lucky Breaks for Humanity. It’s a timeline, starting with the Big Bang, of all the things that had to happen just so, for the universe to develop in a fashion that would allow us to be here.
It starts with getting the density of the universe just right, and the balance of matter and antimatter just right, and goes all the way up through the dinosaur-killing asteroid making room for us little mammals, and the conditions that may have led to the evolution of language. The whole thing is online here.
But wait—aren’t there supposed to be “no accidents”? Hmm. If questions like that, in the context of issues like this, cause you to twitch one way or another, maybe you should read Beyond God and Atheism: Why I am a ‘Possibilian’ in the same issue of New Scientist. Alas, you must be a subscriber to read the whole article, but the title and opening paragraphs give you a pretty good idea of the content.