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

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image credit: Mikhail Matz; image source; larger image

Detecting Fluorescence: Green, Yellow, Orange, and Red in the Deep Sea

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image credit: M. B. Schwenn, (image not available elsewhere on web), larger image

Ancient Observatories: Chaco Canyon

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Rate these Quotations by Famous Physicists

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"Look here, I have succeeded at last in fetching some gold from the sun." - Gustav Kirchhoff

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"Understanding is, after all, what science is all about-and science is a great deal more than mindless computation." - Roger Penrose

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Which physics relationship is more important?

How the force of gravity is 39 powers of ten weaker than the electromagnetic force. Had gravity been much stronger, stars would have burned out much faster, and life would not have had enough time to evolve.
How the "strong" force between nucleons depends on their separation (stabilizes the nucleus against electrostatic repulsion of the protons).



Which unanswered question in physics is more important?

Does the proton decay?
Do quarks and leptons have internal structure? (Protons and neutrons are made of quarks; the electron is a lepton.)


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