It is a unique way to get students to review reading and math concepts. Each capsule contains a math question or a (very short) reading passage with one comprehension question. When students turn the knob on the vending machine, they randomly select a question to answer.
The capsules were purchased on Amazon for about $14.00. I used an empty box with a window cut into it to create the vending machine. A rolled piece of cardboard with a kitty litter jug cap glued onto it served as the turnable knob.