Anyone feel like explaining it to me like I'm 5? High School physics was over 40 years ago, and while I like reading "layman's" science this one only made me think about the discussion of diminsions in 3 Body Problem, which also confused me. Frankly I've never figured out why people write of dimensions as if Time isn't one (e.g. isn't the 2D material discussed actually 3D?) Is it just understood that Time is a given one doesn't have to name?
TIA