I like taking data of an electronic component from a simple experiment and to make sense of it all… took me a while though to fit the data altogether, just a simple math I kept on forgetting, a loadline… it’s only when all the numbers from the experiment fit so nicely of course, within some acceptable experimental errors between the observed and the calculated (it’s really important especially for a circuit designer to know some basic data of his components if it’s possible for him to devise simple experiments rather than just getting the facts from datasheets)