re: #199 Blue Spot Vlamingii Tang

Not so. Einstein did not work with demonstrable facts. That much of what he predicted turned out to be verifiable is an illustration of the foolishness of “predicting” that what is not known cannot be known.

Yes he did. Math, physical laws, previously proven hypothesis, Newtonian formulas, and many other scientific facts. He was attempting to bring everything together into a unified theory, using his and previously demonstrated facts and theories together. In this process he found some inconsistencies in old theories when put up against newer revelations (or revealed by his thought experiments), but he most certainly used facts (math is a really factual science, 1+1 will always equal 2)