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    String Theory: Forever safe?

    When was ST ever called Physics? Is it official or something? And wasn't the testable part supposed to be the existance of supersymmetric particles? What happened to that?
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    Peter Lynds' paper and his 'theory' of time

    A Hoax! This just in, it was all a hoax! I'm going to start trusting my baloney detector more. :)
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    Americans still positive about space program

    That's a pretty interesting effect, bout the X-Prize. And I'm not surprised that the unmanned missions have been relatively unscathed. I know that there's a faction at NASA, esp. JPL, that feel that the manned part of NASA is a complete waste of resources. I'm inclined to agree because we can...
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    Peter Lynds' paper and his 'theory' of time

    Yeah, I was thinking that Lynds is proposing nothing new. The real question is, does he really have something that will make new physics? Wheeler calls him 'bold' and I'm inclined to think that it's just a polite put-down, unless it's actually a hoax.
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    Peter Lynds' paper and his 'theory' of time

    Um, hello? The paper is hyperlinked in both my first post and second. Again, in full blown URI format:
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    Peter Lynds' paper and his 'theory' of time

    Hmm.. it works fine for me in both Windows Adobe and Linux gv. Perhaps upgrade? by google. If that doesn't...
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    Peter Lynds' paper and his 'theory' of time

    An article about some Peter Lynds fellow and his mind-blowing theory of time that has "rocked the physics world" appeared on Slashdork. Naturally enough, my combo quack and hoax detector started beeping. Well, here's his paper. I don't have time to deconstruct it, so I ask the community here...
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    Star Processing!

    If you want to go hard core, take a peek at Kippenhahn and Weigert's Stellar Structure and Evolution. It provides a comprehensive overview of stellar modeling, including various numerical and computational methods of simulating stars. To keep things simple, you probably want to avoid varying...
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    Has anyone here ever been abducted by aliens?

    Yes, in a manner of speaking. I was abducted from my room and showered by a group of dorm mates dressed as aliens.
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    How does building your own complete custom road legal car(atleast for the US) work?

    Let's start with the most obvious: What are you going to do for insurance? In California, insurance is required to register a personal car. It's probably the same in many states. Otherwise, check with those national solar car racing groups for advice. Find out how they were alowed to drive...
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    'Bigfoot' spotted in China: BBC News

    Perhaps on a deeper level the Yeti, etc are merely ancestral memories of our mortal enemies, the Neanderthals? ;) That would go a long way in explaining this crop of nonesense.
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    Imaginary part in Ds

    Hmm, that line needs a little more explanation. What I meant to say was that the math that gives rise to "ict" can only work in Euclidean, or flat, spacetime. It won't work in curved spacetime. For that, we need differential geometry, and we don't need no "ict" for that.
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    Math required for LQG

    Great stuff! I think I have an idea of what rough edges need polishing. Thanks for the pointers and papers!
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    Imaginary part in Ds

    I'll provide another answer, which I hope helps people understand. The imaginary component ict in special relativity is just an artifact of the math chosen to work with the theory. In Gravitation, by Thorne, Wheeler et al, they do away with this in favor of math that doesn't use ict. There...
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    Orion's XT8 8 Dobsonian as a good beginner scope

    For eyepieces, get a 26mm super plossl and a 9.6mm and maybe a 15mm. The 26mm is standard for scopes of that size and the 9.6mm provides an almost optimal magnification. If your scope does not have a drive, then using the 9.6mm eyepiece can be a pain because it will be hard to keep the subject...
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    How to study well in Math ?

    It helps to have a visual thing to play with if you're doing geometry. Cutout shapes, multi sided dice, programs that let you construct geometric things geometrically, and so on will help you enormously. These techniques continue to help even in higher level math.
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    I'm not asking for answers, just ideas for my science hw

    This is High Schoo level, right? If so, those are pretty serious demands for a science project. Heck, I know several postdocs who would kill to be able to meet any of the criteria! If I were you, I'd assume that the judges are just putting pressure on the students to excell. In which case, you...
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    Traffic Sensors

    Oh, so that's how the left turn light near where I live works. I've been wondering how it knows when a car is in the turn lane. There are no obvious cables and such.
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    What's there to see in the night sky at this time of year?

    San Diego, huh? I'm in Pasadena. The best viewing I know of is in Joshua Tree Natl. Park, which should be within distance for you. I usually go to Mt. Wilson. There's lots of stuff to look for in the Summer. It's pretty much constant, except for planets. Check out old astronomy magazines in...
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    Math required for LQG

    Ok, thanks for the info! I'll pursue the leads--they're sufficient to get me started. (I'm in the US. My alma mater is Caltech, but I've been out of the academic loop for awhile.)
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    Math required for LQG

    I'd like to acquire more than a casual understanding of LQG, and to do that I need the math first. My math background has been acquired ad-hoc while pursuing a degree in Astronomy. A smattering of group theory here, enough differential geometry and tensor gymnastics to read Gravitation (Thorne &...