These Counting Activities: Building Pizzas can be set up as cookie sheet activities, a magnet center, or math center. This set includes two pizzas, 12 build a pizza instruction cards, and lots of build a pizza building pieces (all in color).
How to set up the science center (with freebies) in your early childhood classroom. One of the BEST articles I've read on science centers both general and specific. Also provides fiction and nonfiction texts to pair with the centers.
Soda Bottle Teeth Brushing: Teeth made from bottom of plastic soda bottles to teach a lesson on what sides of teeth need to be brushed and on how to floss using yarn for floss and tissue paper for food particles.