When I was younger, I wished I had super memory etching every formula there is in school. In the University courses I took, where open book is uncommon, the number of formula for one paper might sometimes exceed 30 and they go like this:
A simple one on Doping Concentration: C(z,t) = Q/sqrt(piDt)*exp[-(z/a)^2] where fixed dose Q= a/sqrt(pi)*c0, diffusion length a= 2* sqrt (Dt), where D = diffusivity of element and t = time, z is junction depth = a* sqrt [ln(Q/Nd*sqrt piDt) and Nd = phosphorus junction depth. This constitute to remembering one formula!
Yet some days you wish you do not remember things which agonises with every detail.
These 4 persons have the mental powers to remember every detail in their life like a VCR. A gift or curse? You decide.
