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"In this edition of HowStuffWorks, we will enter the tiny world of light microscopes and examine the various technologies that let them expose what is otherwise undetectable to the human eye."

"In this article, we'll help you understand what makes clocks tick, so the next time you look inside one you can make sense of what's happening. Let's get started by taking a look at the different parts of a pendulum clock."

Contracting a muscle--animations showing the steps of contraction and useful rope analogies