FACTivity – Swimming Upstream Without a Ladder

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For this FACTivity, you will answer the question: What is the difference between having a 50 percent chance of having something happen and having less or more than a 50 percent chance? You will answer this question by simulating shrimp moving downstream and potentially being caught by a pipe.
Materials:
- 3 yardsticks
- 1 piece of 22-by-28-inch posterboard
- 100 marbles
- A coffee can
- Data log (included)

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Swimming Upstream Without a Ladder: Dams and Pipes and River Shrimp Movements
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