Back in my naturalist days, one of my most-favorite pastimes was to dip a pail of water from the mucky, algae-filled edges of a pond and spend a couple of hours exploring its contents under a microscope. I could get lost in that delicate spirogyra forest, searching for its single- and few-celled inhabitants. Some of my favorites were the rotifers, transparent creatures with an incredible propulsion system. (Their name comes from the Latin word that means "wheel-bearer" because each rotifer has a ring of cilia - little hair-like projections - that move rapidly, causing the organism to spin.)
Today, Chris Clarke has added to my knowledge with one of his signature posts about evolutionary biology. He begins with the rotifers and takes us on a journey through various forms of sexual and non-sexual reproduction, discussing the evolutionary preferences for each, and ending up where the title begins: "What Really Bothers the Creationists." Highly recommended.