Recent content by trainman2001

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    Baltimore's Francis Scott Key Bridge Collapses after Ship Strike

    There was a failure on the ship. Period. What the failure was is not know yet, but this ship had been involved in a collision in the past, and damage could have been remaining. As for the bridge collapsing: Cantilever structures are a delicate balancing act. They're not designed to have one...
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    Iceland warming up again - quakes swarming

    Whoever coined the term "Terre Firma" didn't know what the hell they were talking about. There is a connundrum with human settlements. Volcanoes produce wonderful soils for growing stuff, and also have the potential to wipe you out in an instant. Russian Roulette on a grand scale. Watching...
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    Job Skills What to talk about with co-workers?

    I have found after facilitating dozens of interactive work groups that there were two kinds of folks in the brainstorming sessions: extroverts and introverts. The extroverts offered many ideas and filled up the charts, but it was the more cerebral introverts that were able to synthesize all that...
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    Don't waste your money on organic food

    Kind of reminds me of the wood-burning stove fad that happened in the 70s and 80s. Sure! If you live on a farm in rural Vermont, go ahead, pick up some dead fall and heat your rustic log home with wood. If you wanted the millions of apartment dwellers in NYC to switch to wood stoves, you'd, a)...
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    Astronauts landing on the planet Mars

    On page one, a comment was made about the explorers on Earth finding edible plants, oxygen etc. From what I understand, Hawaii had NO edible plants and the early Polynesian settlers had to bring them from whence they came. That said, certainly Mars holds significant challenges. Whether we meet...
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    Daylight Saving Time Permanent in 2023: Senate Unanimously Approves Bill

    Many European countries go on "Summer Time" too. Funny story. We had just moved to Düsseldorf, Germany four months before in early 1999. Our daughter and son in law came to visit. We had driven to Köln and were at the main train station and we looked up at the clock and it was one hour later...
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    Non-hydrocarbon based instrument lubricants

    Why is "non-hyrdrocarbon" critical here. Furthermore, I've never heard of anyone lubricating micrometer threads in the first place. I have a Starrett 1" mic that's at least 60 years old and requires no lubrication at all. Threads are ground and polished and have very little friction. I don't...
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    Why does air smell different after using a CPAP machine?

    How can we get an air sample that hasn’t touched any thing/surface where an odor could be acquired? The CPAP example is not a good one because the filter, ducting and fan all could contribute molecules to the air stream. Pure demineralized water has very little taste. It’s the dissolved stuff...
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    B Questions on how helicopters fly

    The fact that you have to adjust each blade as it's rotating (cyclic pitch) and adjust the overall pitch value to add or decrease altitude, and cyclically move the individual blades so the forward moving blade can actually move the helicopter forward as well as balance lift is what makes...
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    B Basic introduction to gravitation as curved spacetime

    That video explaining the concept of gravity to five levels of experience was terrific! Still left with more questions than answers, as were the folks in the video.
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    Major Nuclear Fusion Milestone: Ignition Achieved

    I just read it improperly. It's good to know there's only one NIF. I've been following that site for years. Interesting to note that they're still making progress.
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    Major Nuclear Fusion Milestone: Ignition Achieved

    I'm confused… are there two NIFs? I believe that the USA has an immense facility at Livermore, but this article is talking about one in the UK. The US facility's goal was to predict fusion reactions without having to build bombs. It is a defense oriented facility. Any power generation benefits...
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    I What does it really mean that photons are quanta of light?

    Am I mistaken or have they "frozen" a laser pulse and photographed it? If that's true, the leading edge of that pulse would contain photons and since they were not moving would that not imply that we could "locate" them?
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    COVID Cross Reactive Covid 19 Immunity From Exposure to Endemic Coronaviruses

    If cold virus Coronavirus mitigate severity of COVID 19, could the inverse be true also; that COVID vaccines could provide some protection against some of the common cold varieties?
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    I How does inertia, a property of mass, arise?

    I like the book in the car example. If we were filming the car turning and the book sliding from above, would we then clearly see the book actually continuing in the original direction of travel, i.e., straight ahead? Starts to sound like Einstein to me. Different descriptions of motion...
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