The explanation of the universe starts with the very basics and grows from there. It's a rapidly expanding subject, after all. You probably won’t understand any more about the universe than you did once it’s done, but you will enjoy a few laughs.
And because an explanation of the universe is quite complicated, exurb1a must jump from one subject to another, which is only more opportunities for puns. I mean, really, who thinks of rhyming ebola virus with Miley Cyrus? Physics can be funny, as well as astronomy, biology, geology, etc. -via reddit