1.   Smoking rules in restaurants are probably the most baffling, varying state by state, city by city and even restaurant by restaurant.

2.   The age limit varies state by state.

3.   The impact of felon disenfranchisement is uneven across the country, because the rules vary state by state.

4.   Those rates vary state by state.

5.   This practice varies state to state.

6.   Even in Medicaid, a nationwide health program for low-income Americans, coverage and payments vary widely state by state.