• a few bamboo skewers
• a plastic zipper bag
• water, or other liquids

1. Fill the zipper bag with water nearly to the top, and zipper it shut.
2. Hold the bag over the sink, and slowly poke a skewer into the bag below the water line. Poke the skewer right through to the other side, still below the water line. Keep the skewer in place. The bag doesn't leak!
3. How many skewers can you put into the bag without a leak? What happens if you skewer the bag above the water line?

How many skewers did you poke into the bag without a leak?

just one
four or fewer
more than four

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