Jack M
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 Dec 29 awarded Famous Question Oct 31 awarded Popular Question Jul 13 awarded Yearling May 11 comment Why can I turn light red or blue by holding my finger up to it? @CarlWitthoft No, no glasses. May 11 comment Why can I turn light red or blue by holding my finger up to it? @borilla When you bring your finger very close (a couple of inches) to your eye, the edge of your finger blurs. You should be peering at the dark/light boundary through that blurring. I found it worked best looking at a metal blind obscuring a very bright sunny blue sky, at a distance of a meter or two. The coloring is more visible the brighter the background light is. May 11 asked Why can I turn light red or blue by holding my finger up to it? Jan 21 awarded Nice Answer Jan 21 awarded Necromancer Jul 28 awarded Favorite Question Jul 23 awarded Teacher Jul 13 awarded Yearling Jul 2 awarded Curious Jun 22 accepted How can I derive this Hamiltonian? Jun 22 comment How can I derive this Hamiltonian? So when I take a partial derivative with respect to $z$ or $p$, $t$ is considered to be constant? Jun 20 asked How can I derive this Hamiltonian? Jun 20 comment How did Eratosthenes know the suns rays are parallel? Aristarchus of Samos: The Ancient Copernicus by Thomas Heath contains the only translation of On the Sizes and Distances I could find, for future reference. Jun 20 accepted What do the derivatives in these Hamilton equations mean? Jun 20 comment What do the derivatives in these Hamilton equations mean? @jinawee My question is more computational/mathematical, but yes. Jun 19 asked What do the derivatives in these Hamilton equations mean? May 6 comment Rocky Planet in the center of System Until your second paragraph, it seemed more like you were asking if there could be rocky objects in a galaxy which don't orbit any star.