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question 5: what's the smallest thing we can see?

Imagine you're out in space and scanning our solar system with your eyes. There's Eve, down on planet Earth, with an apple in her hand. Obviously you can't see her or the apple. Or can you? Nano scientists face the same astonishing size differences. The difference in size between the Earth and the apple is the same as the difference between the apple and a carbon atom in its peel!  Read more