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  1. M

    Naive Question about Dark Matter

    Very roughly put, my limited understanding is that dark matter is postulated because of effects seen in the geometry of space similar to those created by matter. Is it necessarily true that there is some form of matter causing that spacial distortion? Couldn't it be postulated that there are...
  2. M

    Anyone play Bejewelled Classic?

  3. M

    Anyone else read Ell Donsaii series

    A friend of mine uses the words "scooby snack" to describe fast lightweight reads. This is a series of simple books, overly simplistic relationships and some interesting implications of the effects of the "impossible". I blasted through 12 of them, and will read more when they get written. I...
  4. M

    True Stories, written in 2nd century

    Since Clarke "invented" the geostationary satellite (I know, he didn't, really, I'm just being snide), I guess Lucian of Samosata invented all this in the 2nd century: In sum, typical science fiction themes and topoi appearing in True Stories are:[3]...
  5. M

    I love perl

    I just feel like rambling on, so I will. Perl gets a bad rap for being hard to read or maintain. But, in reality it is just as easy to read as C or any other language. What is difficult about perl are the regular expressions, which are notoriously cryptic. But, regular expressions are...
  6. M

    What is a magnetic field? (fun mental exercise)

    Think of a charged particle moving parallel to a wire carrying a constant current. The magnetic field caused by the constant current exerts a force on the moving particle (say it moves towards the wire). Now, think of the same thing from a different reference plane. Think of a still particle...
  7. M

    Literary Science Fiction

    An coworker's loves Charles Dickens and reads all sorts of other books with "high literary content". Most science fiction doesn't qualify as great literature. Lots of shallow character development, generally simplistic moral conflicts, etc. Mostly we have good stories in interesting...
  8. M

    ? about Soldering Iron Tip Care

    I have a Weller WTCP station (antique) that I just bought new tips for. I read in some tip reviews that the new "lead-free" technology has ruined the lifespan of tips. Does anyone have any tricks or hints to lengthen the lifespan of these new tips? Any process that can improve the tip? Any...
  9. M

    Minimal no collapse interpretation

    Is this a proper summary of a minimal-no-collapse interpretation? (I like to call it the fuzzy world interpretation, but I suppose I'm the only one) When objects entangle, it constrains their degrees of freedom. As they entangle with more and more objects, their degrees of freedom are...
  10. M

    Division between QM and Interpretations

    Trying to relate a bit better to where QM stops, and Interpretations begin. Especially with respect to Decoherence. Is Decoherence seen as a measurable phenomena, or, just as a "possible" explanation for measurable phenomena? Obviously when I mark a path in a 2 slit experiment I cause...
  11. M

    Question about Tensor Product

    In QM the tensor product of two independent electron's spin state vectors represents the product state which represents the possible unentangled states of the pair. I don't understand why the tensor product produces that result. |A⟩=|a⟩⊗|b⟩
  12. M

    Musings about complex numbers

    I have a view of complex numbers and the way they are taught. I think the whole concept of i as the sqrt(-1) is a terrible place to start. And calling it "imaginary" is worse yet. They should be called blue numbers, or vertical numbers, or something. They are anything but imaginary. It is...
  13. M

    Question RE: Susskind Entanglement Lecture 2

    In lecture 2 of the Entnglement lecture series at, Susskind is explaining a classical interpretation of Measureable and Observable that left me confused. I'll watch it again tonight, but thought I might get a good clarification from the excellent teachers here. In his...
  14. M

    Modern Physics view of Length Contraction?

    I've been told several times that length contraction is not "real" in the sense of material or its space actually contracting. How does modern physics (by that I mean what is being taught currently) view Bell's spaceship paradox. Will the string break? Why, if length contraction is not real...