Relativity

Couple of random comments, since Tuesday's lecture probably seemed really tough.

(1) I think relativity is the hardest stuff we cover. We cover it first because we can make use of it later in a good way, and because it follows PH101 more logically.

(2) Particularly the first day, relativity is really bewildering. Typically, it makes a lot more sense on day 2, when we get a little bit further along and start to apply it in a concrete way. It is something like 'day 1: why things are weirder than we think' and 'day 2: shut up and calculate.' Day 2 is usually where things make more sense, or at least one just trusts the formulas we developed and tries to figure out what one can do with them.

(3) Based on the above, don't get too worried if today seemed like a rough start. It will make more sense on day 2, and the subsequent material is conceptually easy by comparison.