Sites

• Pulp: LP solving for python
• Pyomoo
• Or tools
• Picat
• Hakank, Many examples and implementations of constraint programming
• Numberjack, but this is perhaps dead.

A search on python constraint programming yields also many useful links to tutorials and documentaion.

• Why airplanes fly There are many `explanations' of why planes fly, and nearly all of them are false, or worse, not even wrong. A number of those are debunked on this site.
• http://colah.github.io/posts/2014-03-NN-Manifolds-Topology/

-Nielsen, Michael: neural networks and deep learning