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49 votes

How are magnets held together, and why do they not explode?

electromagnetism condensed-matter magnetic-fields material-science asked Feb 10, 2020 at 3:54
physics.stackexchange.com

33 votes

Why should the frequency of heads in a coin toss converge to anything at all?

expected-value frequency law-of-large-numbers asked Feb 9 at 16:16
stats.stackexchange.com

25 votes

Is there any theory or field of study that concerns itself with modeling causation rather than correlation?

causality model asked Mar 18 at 15:04
stats.stackexchange.com

22 votes

When an object crosses a black hole event horizon, does the entire object cross the event horizon "all at once?"

general-relativity black-holes event-horizon asked Jan 16 at 23:55
physics.stackexchange.com

20 votes

Flywheel half-way through the event horizon of a black hole vs the equivalence principle

general-relativity black-holes event-horizon equivalence-principle asked Jan 14 at 5:23
physics.stackexchange.com

14 votes

Have we directly observed the electric component to EM waves?

electromagnetism electromagnetic-radiation charge asked Apr 17, 2017 at 4:51
physics.stackexchange.com

12 votes

Is there a Lagrangian that produces these equations? How can I find one if it exists?

ordinary-differential-equations calculus-of-variations inverse-problems asked Dec 21, 2021 at 18:47
math.stackexchange.com

12 votes

How can classical bits be copied if qubits cannot be copied?

information-theory unitarity no-cloning-theorem nonclassicality asked Feb 15 at 2:42
quantumcomputing.stackexchange.com

11 votes

Between any two continuous functions $f>g$, can we find a real-analytic function?

real-analysis analysis power-series asked Dec 11, 2017 at 10:11
math.stackexchange.com

10 votes

What piece of technology is able to record the exact phase of microwaves?

antenna oscilloscope microwave asked Mar 2, 2020 at 5:35
electronics.stackexchange.com

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