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We love growing polymer science at sciencebobstore.com, and we were really amazed by this shark that starts off 6.5 inches (14 cm) will grow to over 16 inches about 10 days. Teaches about water absorbing polymers, increases in mass, measuring and charting, and simply impressive science.
Does the water that the shark grows in affect its final size? You can test several sharks in different liquids such as tap water, distilled water, and salt water to see if they affect its growth. You can also measure and chart the growth each day to see if the different liquids also affect the rate that the sharks grow. Let us know what you find out!