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

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image credit: U.S. Navy photo/Petty Officer 1st Class Ronald Dejarnett; Image source; Larger image

Scientific American: What happens when an aircraft breaks the sound barrier?

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image credit: USGS; image source; larger image

BBC News: Italy's Earthquake History

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Rate these Quotations by Famous Physicists

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"not even false" - Wolfgang Pauli expressing contempt for an idea not even good enough to be considered "false".

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"Who ordered that?" - I.I. Rabi expressing dismay at the identification of the muon, a hard-to-account-for particle whose mass is 207 times the mass of the electron.

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Which physics relationship is more important?

How the density of water depends on temperature (enables aquatic life to survive cold winters).
How the increase in temperature vs. depth for Earth (creates the "oil window"--7,500 feet to 15,000 feet--where dead organisms were cooked into oil).



Which unanswered question in physics is more important?

Why does the observable universe have hardly any antimatter?
How can we explain the "Pioneer Anomaly?"


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