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Welcome to Interact, where you can tell us what you think.

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photo credit: Richard Heeps Photography

How Things Work: Front and Rear Bicycle Brakes

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image © Institute of Physics; image source; larger image

Newton's Third Law of Motion

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Rate these Quotations by Famous Physicists

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"Strings create everything, including space and time and even us." - Jim Gates

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"The scientist does not study nature because it is useful to do so. He studies it because he takes pleasure in it, and he takes pleasure in it because it is 'beautiful.'" - Henri Poincare

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Which physics relationship is more important?

How the "strong" force between nucleons depends on their separation (stabilizes the nucleus against electrostatic repulsion of the protons).
How dark matter is required to provide enough gravity so that matter in the primordial universe clumps together (to begin the formation of stars and galaxies).



Which unanswered question in physics is more important?

Can string theory be tested experimentally?
What is dark matter?


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