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 Jul 16 awarded Popular Question Feb 20 awarded Yearling Nov 15 awarded Critic Nov 14 answered What is the difference between a white object and a mirror? Nov 14 answered What's the difference between dim and bright light? Nov 13 comment Desperately Need Help with Grade 9 Static Electricity In these situations, you have at least two approaches with your grade nine class: 1) do not show them the foil interacting with the screw, since you can't explain it to your own satisfaction, and 2) show them the interaction, and tell them you don't know why it works that way. I would go with option 2: you might just have someone in the class who CAN explain it (a), and (b) you might just inspire someone to go into the sciences, because the excitement of science lies in exploring new things and in seeking explanations based on what we already know. Nov 13 comment Alternate layman's metaphors for illustrating curved space-time @Lub, it's a different question, and I think your 2nd comment should be added as an answer. Nov 13 comment Alternate layman's metaphors for illustrating curved space-time Could you provide a citation that explains the distinction between intrinsic and extrinsic curvature as it relates to gravitation? I'm having difficulty accepting that the curvature of a bent piece of paper is zero. Nov 13 comment Desperately Need Help with Grade 9 Static Electricity Hmm, very curious. I must try this experiment for myself! Nov 13 comment Desperately Need Help with Grade 9 Static Electricity In any case, it's a good idea not to accept answers right away anyway, to encourage answers from others first.Cheers, JB Nov 13 comment Desperately Need Help with Grade 9 Static Electricity To your second objection, if the inside of the PVC is negatively charged, the tip of the screw, being on the inside of the pipe, would be induced positively as well. You can test the charging of the inside of the pipe with your negatively charged foil. Nov 13 comment Desperately Need Help with Grade 9 Static Electricity To your first objection, with induced charges, the forces depend not only on the amount of charge but also on the spatial variability of the force (the force is proportional to the gradient of the electric field). The smallness of the screw compared to the size of the pipe means there will be large forces present. Nov 13 answered Desperately Need Help with Grade 9 Static Electricity Nov 11 comment What are the specific requirements for a do-it-yourself quantum double-slit experiment? Young's slit experiment as described in the videos with ordinary light can be explained classically using interference of waves. It's a good question though how to do the quantum version of it using single particles at home. I wonder about using a cooled CCD capable of single photon detection (maybe an EMCCD) looking at a faint astronomical source through a telescope. If you can show a time-lapse movie of the build-up of the image, one photon at a time, you'd be demonstrating the quantum nature of light. Jun 24 answered How to place a mirror parallel to a wall? Mar 19 asked What is the most energy efficient way to boil an egg? Feb 8 awarded Supporter Feb 8 awarded Teacher Feb 8 revised Can Maxwell's equations be derived from Coulomb's Law and Special Relativity? Changed displacement current to LaTeX form. Feb 8 answered Can Maxwell's equations be derived from Coulomb's Law and Special Relativity?