Despite all the talking about inevitability of its flow, time is actually quite a flexible concept. We are driving east on the interstate 90 and out of a sudden there is a sign: Central Time Zone. We didn't cross any state borders and - judging by the total blackness on both sides of the highway - we are in the middle of nowhere. And without much warning one hour of our day is gone. I suppose middle of nowhere makes sense for a time zone change. And the hour that we just gave up wasn't ours to keep. We borrowed it in July when driving through similarly empty Texas. Although why in South Dakota the time zone change line isn't straight is beyond me - there are only 4 states in the Union with fewer people per square mile.