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 Feb 4 awarded Yearling Jan 2 awarded Popular Question Oct 13 awarded Popular Question Jun 11 awarded Notable Question Feb 4 awarded Yearling Nov 25 comment Why does the Sun always rise in the East? @supercat, yeah you are right, very slow spin could also be a possibility. Nov 25 comment Why does the Sun always rise in the East? @supercat, Yeah I got that too, and that would be due to very fast orbital motion, which is not the case here. Nov 25 comment Why does the Sun always rise in the East? @supercat, yeah I agree with you as I have already confessed in earlier comments that if that is the way North is defined there then the sun rises in the east in those planets too. Nov 25 revised Why does the Sun always rise in the East? added 1 character in body Nov 25 answered Why does the Sun always rise in the East? Nov 20 revised Why can we see white objects as white under the sun if the sunlight is yellow? added 3 characters in body Nov 20 answered Why can we see white objects as white under the sun if the sunlight is yellow? Nov 19 comment Why can we see white objects as white under the sun if the sunlight is yellow? you might be interested in this. See the irradiance is maximum in the visible region. Oct 23 comment What is the meaning of spin two? Hi you have discussed spin-0 particle as the quanta of scalar field, spin-1 particle as the quanta of vector field and spin-2 particle as the quanta of tensor field. But what about spin-1/2 particles? What do we call the field of spin-1/2 particles? Oct 12 comment Jarlskog Invariant and its mathematical origin @LubošMotl, The quotation in my comment is from your answer (see just below the definition of J) where you have mentioned if any of the sines or cosines of the angles is zero then the U matrix can be brought to real. But from standard parametrization, we see that if $s_{13}=0$, then only U matrix is real. Oct 12 comment Jarlskog Invariant and its mathematical origin @LubošMotl, Is this really true "or if any of the sines or cosines of the angles vanish in which case it's also possible to bring the matrix into a real form." ? I thought it is possible only when $s_{13}$=0. Can you give some reference ? Sep 25 revised Why doesn't current flow when the wire is open? added 1 character in body Aug 30 comment Finding the direction of the magnetic force acting on a conducting wire The Lorentz force acting on the wire is given by $\vec{F}=q(\vec{v} \times \vec{B})$. If you don't know how to find the direction of the cross-product of the two vectors, please refer to this wiki article Aug 28 comment Why there is a time gap between the news presenter and the field reporter? @MikeDunlavey, In that case it would be better to mention your guess in few words too so that everybody knows what maybe a possible answer. Aug 27 comment Why there is a time gap between the news presenter and the field reporter? @MikeDunlavey "So the field reporter would hear the question sooner if he simply watched the channel!" .It is not necessarily true. Suppose anchor says XYZ at 12:00:00 and time required to reach the signal(XYZ) to reporter and return back to the anchor is 1 second. Then anchor sees the signal(XYZ) come from the reporters cell phone at 12:00:01. But that does not necessarily mean you are also watching these at the same time. Maybe the signal takes 5 seconds,say, to reach you. so you are hearing anchor's question at 12:00:05 and the reporter's cell phone at 12:00:06.