Recent content by puf_the_majic_dragon

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    I How do you answer "So what's the practical application....?"

    Mathematics is not simply calculation, it is problem solving. Most people hate math because doing repetitious calculations on homework assignments is boring and monotonous and teaches very little after the first few lessons in arithmetic. Most people enjoy problem solving. When you go grocery...
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    General science resources for a 7th grade level

    She tutors a remedial class where her students, based on how she's described them to me, are actually fairly bright but completely and totally disengaged from the learning process (and therefore behind on the learning curve and grade scale). I believe she intends to use these particular themes...
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    General science resources for a 7th grade level

    So I spent like half an hour talking my friend up about this site and how the people here were intelligent and educated and helpful. I feel kind of let down by this response. Time travel is science. Nevermind that we're all time travelers, what about the passengers on the ISS who are traveling...
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    General science resources for a 7th grade level

    My friend is a 7th grade teacher and has asked for help finding resources she can share with her students. Web sites, videos, books, etc. appropriate for a Jr High/middle school level. Specific topics she'd like to cover would be: time travel economics (socialism vs capitalism - real economics...
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    Twins flying at the speed of light in opposite directions

    It seems the Doctor Who reference was completely lost. The idea is of a magical "window" that peer into another reference frame and yet let's you observe it relative to your own. Of course no such feature of the universe exists. But neither does a cat in a box with a poison capsule and a...
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    Does current flow in both wires or in one in our homes?

    This was a great explanation for me: https://www.physicsforums.com/threads/question-on-live-and-neutral-wire.825694/page-3#post-5192017
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    Twins flying at the speed of light in opposite directions

    I'm kind of amused at all of the overly technical explanations in this thread. Here's the simplest explanation I can give: The faster you move, the slower time moves. But slower implies comparison, time is moving slower for you compared to what? Anything moving slower than you are, really. But...
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    Shopping advice: Solar battery charger and power supply

    I've never seen 1.5v lithiums. Since I haven't had any success finding a 3v complete setup, I just ordered a https://www.amazon.com/gp/product/B005ZSVZRY/?tag=pfamazon01-20 and that buck off Amazon. We'll see how much trouble I can get myself into over the weekend. Cheap charger, buck...
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    Shopping advice: Solar battery charger and power supply

    I'm using li-ion AAs. I think part of the problem is most rechargeable batteries list at 1.2v rather than the 1.5 that the timer would get out of alkalines, so it thinks the batteries are deader than they are. It said battery "low" on Saturday so I replaced them and checked the old ones and they...
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    Shopping advice: Solar battery charger and power supply

    I'm sorry if this isn't the right place for a shopping question, but I'm not sure where else to go for advice. I got a https://www.amazon.com/dp/B0094KM4VK/?tag=pfamazon01-20 on sale and the unit is great, but the batteries don't hold a charge very well, especially when using rechargeables - it...
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    Building a Router from Scratch: A Beginner's Guide

    I'm a little disappointed in most of these responses. Sergeyrar is clearly doing this as a learning exercise for fun, which means the end goal is not something nearly as complex as a Cisco 4000 ISR. I get it - I do the same thing. Why use something someone else already built when I can build it...
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    Computer New Computer Build Recommendations

    I'm a fan of Zalman... http://www.newegg.com/CPU-Fans-Heatsinks/BrandSubCat/ID-1647-574 In 2007 I put a Zalman 9700 in my 2006 build and dropped my CPU load temps by 15c. (Cut an additional 5 degrees out with an XClio case.) The best part was that I could reuse the fan when I upgraded from an...
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    Computer New Computer Build Recommendations

    The AM3+ CPUs don't have the graphics SOC. You're probably thinking the AMD APU, which is essentially a Radeon built onto the CPU die and only available for FM2/FM2+ boards. I haven't played with any of the FM2/APU stuff, so I don't know a lot about it. That is the direction AMD has been going...
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    Computer New Computer Build Recommendations

    So... full disclosure, I'm an AMD nut. Have been for years, even after Intel finally demolished their compute advantage with the i3. AM3+ CPUs are fully compatible with GeForce video cards (I have an AM3+ with the 8350 Black CPU). Given your system was built in 2007, it should be PCIe, but...
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    Question on live and neutral wire

    THIS answered my question :) and in such an elegantly simple way (way more simple than I was expecting). And yeah, I did kind of hijack this thread, but I rationalize it because this understanding puts all of the other answers to the OP into a context. Your answer to my question answers the OP...
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