# Physics
A very interesting article on why the sky is dark at night: https://arachnoid.com/sky/index.html


# Learn
Study The Theoretical Minimum at https://theoreticalminimum.com/courses for a series of courses taught at Stanford by Leonard Susskind:
"These courses collectively teach everything required to gain a basic understanding of each area of modern physics including all of the fundamental mathematics."


See also
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https://ophysics.com/index.html interactive simulations
http://hyperphysics.phy-astr.gsu.edu/hbase/index.html hyperlinked topic map