Can iPads help students learn science? Yes.

The scale of the universe can be difficult to comprehend. Pretend you are going to make a scale model with a basketball representing the Earth and a tennis ball as the Moon. How far would you hold the tennis ball "Moon" from the basketball "Earth?" Most people would hold them at arm's length from each other, but the answer may surprise you: at that scale the balls would need to be held almost 30 feet apart.

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