How to make shady areas safer, esp for women and children?
Maybe install solar panels that act as shade during the day and light sources at night. Two birds, one stone.
When you poke at something as large and complex as "people," you sometimes get what you want, but you also sometimes get what you didn't expect.
This article is worth the read: http://www.nejm.org/doi/full/10.1056/NEJMhpr051833#t=article
The 4-2-1 problem: http://en.wikipedia.org/wiki/One-child_policy#The_.22four-tw...