Index Cards
To be honest, I didn't even consider index cards in my initial list of possible items. But there are so many ways to use them, beyond just flashcards!
Index Card Slides
Step Through an Index Card
An Index Card and a Cup of Water
A Penny for Your Finger
Mystery Jars
Penny in a Cup
Layered Water
Mitosis Line-Up
Boat Races
Photosynthesis Races
Flip an Arrow
Water Drop Microscope
Jumping Frog
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