THIS DAY IN SCIENCE: The first helicopter in 1877

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This demonstration shows some differences between potable (drinkable) water and non-potable (non-drinkable) water. Variations in temperature, turbidity and pH level also determine the types of microorganisms that can thrive in each water sample. After the demonstration, students will be able to hypothesize why different types of water can cause illnesses and even death in humans.

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