#### [[Computers do lots of small operations very quickly]] --- Everything you see a computer do is a long concatenation of these very simple operations , the ADDing , NOTting , Shifting , ANDing , ORing , XORing of bytes , Storing , Loading , Jumping and I / O operations , via the execution of the instruction code from RAM . This is what makes a computer a computer . This is the sum total of the smarts in a computer . There are about 20 "words" used as code at the lowest level. NAND is the core operation of computers. --- Tags: Reference: [[@scottHowItKnow2009]] Related: Feynman youtube on computers as very stupid filing systems