The universe is a hollow sphere floating in the middle of a sea of fire. There are numerous tiny holes in the surface of the sphere, as well as a lar… - Liu Cixin

Because of the speed of light. The known universe is about sixteen billion light-years across, and it’s still expanding. But the speed of light is only three hundred thousand kilometers per second, a snail’s pace. This means that light can never go from one end of the universe to the other. Since nothing can move faster than the speed of light, it follows that no information and motive force can go from one end of the universe to the other. If the universe were a person, his neural signals couldn’t cover his entire body; his brain would not know of the existence of his limbs, and his limbs would not know of the existence of the brain. Isn’t that paraplegia? The image in my mind is even worse: The universe is but a corpse puffing up.

It’s an interesting thing, really: The rigorous, science-based predictions of scientists and futurologists and the spirited “flights of fancy” of sci-fi writers are just about equally (in)accurate!

Real shrewdness means not letting any shrewdness show. It’s not like in the movies. The truly astute don’t sit in the shadows all day striking a pose. They don’t show off that they’re using their brains. They look all carefree and innocent. Some of them are tacky and mawkish, others careless and unserious. What’s critical is not to let others think you’re a person of interest. Let them look down on you or dismiss you and they won’t feel you’re an obstacle. You’re just a broom in the corner. The pinnacle of this is to make them not notice you at all, as if you don’t exist until the moment right before they die at your hands.