Very few species have survived unchanged. There's one called lingula, which is a little shellfish, a little brachiopod about the size of my fingernail, that has survived for 500 million years, but it's survived by being unobtrusive and doing nothing, and you can't accuse human beings of that.
We only know a tiny proportion about the complexity of the natural world. Wherever you look, there are still things we donβt know about and donβt understand. [...] There are always new things to find out if you go looking for them.