This is a good Venn diagram.

A few months back, the Caltrans Performance Measurement System (PeMS) …

Higher income usually means more childcare, and lower income usually means less.

See what we ate on an average day, for the past several decades.

Variation kicks in when you look at the later years, consider multiple marriages, divorce, separation, and opposite-sex versus same-sex relationships. This chart breaks it all down.