Science experiment with magnets: Put iron-fortified cereal (like Total) in a bag with water. Let it sit for 20 min., then rub a strong magnet all around. Pull it up to the top and you'll see you've collected the actual iron from your cereal!
I wish I had lessons like this when I was trying to learn :) Great activity during a weather unit. 2 liter soda bottle cut in half. Put about an inch and a half of warm water (w blue food coloring) in the bottom. Invert the top of the bottle with the lid on and fill with ice. Watch the water condensate and watch it "rain" THIS is brilliant!