My children are like sponges- Audge because she basically sucks up every piece of disgustingness ever. You should have seen her last night. Her hair was plastered up with only the aid of ice cream and black beans. She looked like the bad guy on the Incredibles, Buddy.
Caitlin's sponge comparison is a little more favorable. She sucks up knowledge. David is teaching her to play some piano notes and as I type I am greeted with a chopsticks-esque trill sequence. It appears as if she is even using middle C.