Conversation between me and small son, then age two and a half. It is January. I am in the basement, using a palm sander. "What's dat, mummy?" "It's a palm sander." "Dat's your pom-pom sander?" I stop the machine. I discern a Teachable Moment, and I can't let that go by. Besides, this is funny. First, let's clarify the source of confusion. We need to Define Our Terms. "What's your palm, Adam?" "It's what goes onna top of my hat!" Yes, it is as I thought. Confounded by a homonym. I turn his dimpled hand over, show him his palm. "This is your palm, sweetie." "Dis is my palm?" "Yes, yes that's right. It's your palm." Very carefully enunciated, very encouraging. Then I take his other pudgy hand and turn it palm-up. "So what's this, then?" He considers both hands very carefully, and looks up. "Dis is my hat???"