1.On the countries of the world:

2.On dates:

3.On snow leopards:

4.On gas:

5.On the Royal Family:

6.On states:

7.On heat waves:

8.On higher education:

9.On the beauty of language:

10.On telling time:

11.On anthems:

12.On gas prices:

13.On Georgia:

14.On drinking:

15.On garbage:

16.On the Middle Ages:

17.On Spanish:

18.On Europe:

19.On the metric system:

20.On Germany:

21.On geography:

22.On cars versus public transportation:

23.On medical care:

24.On Tylenol:

25.On war:

26.On trains:

27.On parenthood:

28.On Scottish heritage:

29.On licensing:

30.On Celsius:

31.On height:

32.On centimeters:

33.On studying:

34.And on measurements:

35.On telling time: