I've started programming when I was ~ 18 years old and my first applications was coded with Pascal programming language for DOS operating system which was powered by Intel 80486 computer. One of my first program's goal was to print on screen atmosphere pressure at a given altitude. Seems that I was interested in calculating formulas very much. Later on when I've started a physics bachelor studies at an university, I've expanded my experience in this area by making a bunch of physics experiment simulation programs. For example- one of these programs have simulated a light refraction laws in a lens given various optical parameters - lens type (biconvex, biconcave,...), distance to focal point, etc.