When good things are given to us, or when we have never known life without them, we rarely appreciate them fully. This truth applies to many areas of life, but tends to be particularly evident with respect to modern conveniences and technological advances. Anyone with a teenager who thinks having a cell phone or an iPod is a requirement, not a luxury, knows this; pointing out that every generation until this one grew up without such devices rarely elicits more than eye rolling. Young people are not the only ones who take things for granted, however. When was the last time most of us truly felt grateful for our flush toilets or hot showers? Probably shortly after a camping trip or when the water heater broke.