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j.c.
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143
Are there examples of non-orientable manifolds in nature?
Nov 12, 2010
53
Analogue to covering space for higher homotopy groups?
Oct 17, 2009
46
What is the exterior derivative intuitively?
Apr 11, 2010
35
Examples where physical heuristics led to incorrect answers?
Jul 1, 2010
32
Largest hyperbolic disk embeddable in Euclidean 3-space?
Oct 15, 2009
23
Conway's game of life for random initial position
May 31, 2013
20
Is there a mathematical and information theoretic explanation for this cube packing phenomenon?
Dec 16, 2017
18
Determining homotopy classes [T^2, RP^2]
Oct 24, 2012
18
Link such that deleting any two components leaves an unlink
May 8, 2018
18
Perfectly centered break of a perfectly aligned pool ball rack
Feb 7, 2014
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Examples of mathematical exposition arising from MO answers
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Best books for mathematical background?
43
Why does the sky change color? Why is the sky blue during the day, red during sunrise/set and black during the night?
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Book about classical mechanics
24
What is the difference between a measurement and any other interaction in quantum mechanics?
24
Why is tape so hard to rip when it is not broken, but so easy once there is the tiniest cut in it?