Computer science and Information technology (IT).

Computer science is what came out of asking: what kind of maths can actually be effectively carried out in the physical world?

Computer science is the science of holism. Unlike in the standard natural sciences, we know the fundamental building blocks perfectly, by assumption. Therefore, reductionism doesn't give you anything. All the questions is about what emergent behhaviour occurs.

Map of computer science

Portal:Computer science

Portal:Information technology

Information technology is the result of actually carrying out this math, an step that required technology.

Nice collection of lecture videos

http://colorfulengineering.org/SCICOMP.html

http://www.aduni.org/courses/

Nice Math ∩ Programming blog: https://jeremykun.com/

http://it-ebooks.org/

http://en.tldp.org/HOWTO/Unix-and-Internet-Fundamentals-HOWTO/

Quantum random number generator: https://qrng.anu.edu.au/

Github