OK, I know this is supposed to be a discussion about photography, but in this case, I want to talk about sweat. I've seen sweat fly before, captured by speedy camera shutters. But it's more unusual to see it take shape like it did here, apparently following the line of Nadal's movement. I like it when still photography, by freezing motion, helps us see things that our eyes wouldn't be able to detect.
Spain's Rafael Nadal plays a shot during his match against Germany's Philipp Kohlschreiber at the Australian Open tennis tournament in Melbourne January 18, 2007.