After my first week as a graduate student, I’ve made the following superficial observations:

• Roughly 75% of the men in my cohort are bald or thinning on top.
• Roughly the same percentage have either a beard or a classic ’90s goatee. (“pudding rings”, as I like to call them.)
• I have both a thinning head of hair and a beard.  So I guess I’ll fit in alright.

On a less superficial level, I heard something kind of profound from one of my professors.  She said:

Those with a bachelor’s degree believe they know everything.  Those with a master’s degree think they know something.  And those with a PhD know they know nothing.

…or something along those lines.  The point is that the more we learn, the more we realize that there is so much more to know.  That is both exciting and humbling.