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 Jul 1 suggested approved edit on Raychauduri equation for Milne universe Jun 29 awarded Yearling Jun 29 comment Why do atomic clocks only use caesium? @EmilioPisanty That's a nice question, but otherwise than "it's stable, it's ubiquitous, it's historical" I can't found any nice explanation on this. Jun 29 revised Why do atomic clocks only use caesium? fixed the incorrect caesium typing Jun 29 suggested approved edit on Why do atomic clocks only use caesium? Jun 29 answered Why do atomic clocks only use caesium? Jun 22 comment Feynman Lectures: Why a non-reversible weight lifting machine cannot lift higher that a reversible one? Just for reference link to a book for this chapter: Feynman Lectures. Jun 22 revised Hamiltonian related to Riemann zeta function improved formatting Jun 22 suggested approved edit on Hamiltonian related to Riemann zeta function Jun 1 accepted “Voyager: Lightning on Jupiter”: what's a sound source for this? Apr 18 comment Which one is colder? Zero temperature ice or zero temperature water? Also, are you talking about temperature in some energy sense? Apr 7 comment 2s orbital wavefunction has non-zero probability at $r=0$? Why not? Especially the marked answer is a clear explanation that the probability isn't just a wavefunction at zero. You forget the volume, which a proportianal to $r^2$, so multiplying by zero is zero. And notice that the plot you added thave $4\pi r^2 R^2_{nl}$, and not just a wavefunction. Apr 7 comment 2s orbital wavefunction has non-zero probability at $r=0$? possible duplicate of Hydrogen radial wave function infinity at r=0 Apr 5 revised What is the physical cause that circulation on a closed surface is zero? fixed equation formatting Apr 5 suggested approved edit on What is the physical cause that circulation on a closed surface is zero? Apr 4 revised What is the significance of the “squared” in $E =mc^2$? fix wrong latex code Apr 4 comment What is the significance of the “squared” in $E =mc^2$? You forget some }s. Apr 4 suggested approved edit on What is the significance of the “squared” in $E =mc^2$? Apr 4 comment What is the significance of the “squared” in $E =mc^2$? possible duplicate of Einstein's mass-energy equivalence Mar 29 answered Why do lines in atomic spectra have thickness? (Bohr's Model)