Are you free?
"The first duty of free people is to say NO."
Jacques Ellul (1912-1994)
Professor of Law
University of Bordeaux
Besides the freedom I have found that this is one of the keys to good time management and stress reduction.
Patterns in space and/or time form in fluid dynamics (Rayleigh-Bénard convection and Taylor-Couette flow), laser physics, materials science ...
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