Elon Musk, How to Build the Future —

Look at, say, ancient Egypt, where they were able to build these incredible pyramids and then they basically forgot how to build pyramids. And even hieroglyphics. They forgot how to read hieroglyphics. Or if you look at Rome and how they were able to build these incredible roadways and aqueducts and indoor plumbing, they forgot how to do all of those things. There are many such examples in history. So I think we should always bear in mind that entropy is not on your side.