Recent content by Fewmet

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    Today I Learned

    Today I learned 1) The actor that played Vic Fontaine in Deep Space Nine also played Dr. Tony Newman in The Time Tunnel. 2) Rhode Island and Providence Plantations became Rhode Island in 2020 3) Chubby Checker's name is an allusion to Fats Domino. (OK: I learned the last of those yesterday.)
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    Today I Learned

    Today I learned that an exonym is a word applied to a "a geographical place, group of people, individual person, or a language/dialect" by an outsider. I also learned that "calque" (a great Scrabble word) is a word or phrase that is taken as a literal translation from another language...
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    Direction of the magnetic field of the Earth

    The dip comes up in geology. As iron-rich lavas cool below, crystals (free to rotate in three dimensions) to the local magnetic field. When the rocks are completely cooled, the dips are locked in place and record the latitude at which the igneous rocks cooled. This is part of the evidence for...
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    B Are all wavelengths of light possible?

    (Maybe this will lead to a post to the "Today I Learned" thread for me.) I had thought that the thermal motion of ionized atoms in a star contribute to its black body radiation. Is that not the case?
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    Today I Learned

    Today I learned how to identify the back locust tree. This came shortly after I learned that the black locust has thorns.
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    Insights Match the Scientist with the Story Quiz - Comments

    A mere two out of ten. I knew the Ramanujan story (than you, Douglas Hofstadter). I had heard the story in #10 without the claim that it was a famous person. I think I would have guessed correctly on #8 if I had connected that János Lajos Neumann von Margitta is John von Neuman.
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    Experiment on Newtons First Law

    Welcome to Physics Forums. I think stamping your foot on the ground to get snow off is a great example: you put your foot and snow into motion. You apply a net force to stop your foot but not to the snow so it remains in motion, coming off your foot. The same argument applies to shaking your...
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    What is the newest installment of 'Random Thoughts' on Physics Forums?

    I recently went through part of the school archives with some high school students. I had to explain to them what the photographic negatives were.
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    Number sequence: 83 80 84 83 88 95 ....

    I can see assessment value in something like that is the task is to see how answers you can generate with convincing rationales. That, of course, is not the case here. I have been following the thread (and working on the puzzle) in hopes that there is a clever, satisfying answer. I would feel...
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    Number sequence: 83 80 84 83 88 95 ....

    Rts: the spaces in the letter puzzle disappeared when it posted. It should loo like this: Right after posting, I found another line of reasoning for 83 being next that is a little more compelling.
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    Number sequence: 83 80 84 83 88 95 ....

    A favorite puzzle of mine starts with this: A E F B D G C and asks where the H belongs. Applying the same kind of reasoning as that one requires and the recurrence of the 83, I can offer an argument for the the next number in dirk_mec1's posted...
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    I Liquid water reservoir reported under Mars polar cap

    I do not know the details of what would reflect radar of the wavelengths they used, but to me "water-laden sediments" carries a connotation of much more water than hydrated minerals. I heard Kathryn Sturman (geophysicist with the University of Texas) on...
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    What is the newest installment of 'Random Thoughts' on Physics Forums?

    I remember the great turning point that came with mine learning to say, "I think I'm going to throw up". We did a lot less cleaning up from that point on.
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    I Liquid water reservoir reported under Mars polar cap

    The analysis is based on 29 radar profiles collected between May 2012 and December 2015. The identified region is about 20-km wide. The report acknowledges the results are consistent with with water or water-laden sediments. A brief discussion on the BBC (with no citations) asserted that...
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    A Photovoltaic Effect in CdS or CdSe

    I am interested by how many website say essentially that Audobert and Stora discovered the photoelectric effect in one or the other of those compounds in 1932 without citation. I found two pdfs that credit the following for the information: Cleveland CJ. Handbook of Energy. In: Handbook of...
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