Monday assorted links
1. Tweet stream on North Korean missiles and what if our interceptors end up going into Russia.
2. Reihan favors a form of proportional representation for the U.S.
3. The artistry of Japanese playgrounds.
4. The forest kindergarten culture that is Danish.
5. Douthat on the West and what comes after.
6. Copper Age trade was considerable, though the Alps were a barrier.