TRUE RANDOMNESS IN A QUANTUM WORLD So, are there any examples of truly random events? The answer is yes, but for these examples, you need to delve into the quantum world of atoms and electrons. In quantum mechanics, interactions and movements are not governed by basic cause and effect but by probability. For example, electrons do not orbit in circles around atoms, they appear and disappear within a cloud surrounding the atom. If you look close to an atomic nucleus (the dark area in the diagram – right) you may spot electrons appearing and disappearing but, you will never know exactly when or where this is going to happen (this event is random). The further you move from the nucleus the rarer these appearances and disappearances become, still following a random sequence. ScienceBlog.com (blog)-Dec. 3, 2017
When you command a computer to generate a sequence of random numbers it actually starts from a seed number (any number can be a seed) and then it runs a complex (but predicable) algorithm to generate seeming uncorrelated, random numbers. Here's a gif of a program I made to illustrate random ...