Another sweltering day in North America. As I tried to cool off by watching a baby moose playing in a sprinkler, it dawned on me that I could jump in the lake on the bike home from work. While mulling over the logistics, it dawned on me how fortunate I am to have this option. In so many parts of the world, a dip in freshwater, where available, is not a particularly good idea. The hazards range from nightmare-worthy to microscopic: errant saltwater crocodiles--oh, don't let the name mislead you--to parasites, amoebas, bacteria, algae, and toxic pollutants. Turns out that even the old adage about safety in moving water is inaccurate. Morgan et al. (2010) recently described an elevated risk of contracting shistosomiasis among extreme travelers (whitewater kayakers and rafters) in Uganda. I think I'll take an extra moment to reflect on the luxury as I splash about the local swimming hole this afternoon.