"What is something that changes?" was the broad question my fabulous co-teacher asked to her kindergarten class.
"An egg. When you throw it. It goes splot."
"A fish. It's alive and it disappears when you eat it."
"Blood. It's blood and then it turns into a boo-boo."
"My apartment. Now its bigger."
"An umbrella. It's closed, then it opens when it rains."