For one of the Labors of Herakles, Herakles had to clean out the horse stables of King Augeus, which hadn’t been cleaned in years and were all full of horse poop. It seemed like it would take forever.
But Herakles isn’t a superhero for nothing! He’s pretty smart as well as being strong. He found a river nearby and dammed it up so it ran right through the stables and washed them all clean.
Learn by doing: check out some horses
More Labors of Herakles
Twelve Labors of Hercules (Step into Reading, Step 3), by Marc Cerasini. Very easy, for beginning readers.
The Story of Hercules (Dover Children’s Thrift Classics), by Robert Blaisdell (1997). Easy reading, very cheap.
Hercules, by Nancy Loewen (1999). More sophisticated, with a look at how the myth was passed on and what it meant to people, as well as the story itself.
D’aulaire’s Book of Greek Myths, by Edgar and Ingri D’Aulaire. (Look under Heracles).
The Myths of Herakles in Ancient Greece, by Mark W. Padilla (1998). By a specialist, for serious readers.