Once you are done demonstrating whatever concept was in the textbook, you throw away the pipe cleaners, the cardboard tubes.
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Related: cardboard
Prev: The NFL charged fans$ 100 for each cardboard cutout at the game. That's a cool$ 3 million in revenue to make up for some of the lost ticket and concession sales.
Next: I got all the flowers and all the grasses ready and printed the names on pieces of cardboard, to stick in with them.
