Today is National Science Day! We’re excited, and perhaps you are wondering why. We are, after all, in the business of books—collecting, selling, and writing about them. Indeed, we share with you who wins the Nobel Prize in Literature, not who wins the Nobel Prize in Physics or Chemistry or even Medicine. But that’s not to say we don’t love science! As a matter of fact, we love it when books and science intersect, which happens quite often. Today, we’re focusing our attention on five of our favorite rare science books. If you, like us, have an affinity to books of scientific importance or would like to build a collection surrounding this topic, read on!