On: Is Math a Young Man's Game? No

[echair]

Because colleges select applicants by aptitude, and elementary schools by proximity.

[Prrometheus → echair]

What accounts for the difference here? Why can't K-12 institutions select by aptitude?

[echair → Prrometheus]

Because you can't pack enough different institutions within a sufficiently small radius.

Parents want 5 year olds to live at home. They're ok with 18 year olds not.

[Prrometheus → echair]

Most people live within range of a few different schools. Why are they all the same?