Use chemistry to make a bouncing polymer ball, then alter the procedure to see the effect the changes have on the characteristics of the bouncing ball.: Make a Bouncing Polymer Ball - Introduction and Materials
Tops and Bottoms book f/u chart. Perfect for plants unit! I would add a picture next to each word for pre-k students. Making this an interactive chart using velcro would be a great hands on activity for this age group as well.
"Seed Writing" -- kids come up with two "watermelon" (BIG idea) topics and then pick out three "seeds" (little events within the BIG idea) and choose one to focus on. Great for when we taught Small Moments