“…In other cases, teachers figure out and build their own experiments and arrange so called low-cost laboratories [9][10][11][12][13]. A third solution, since the advent of the Internet was, of course, the development of virtual (simulated) experiments and laboratories [14] that reproduce, using a computer program and graphics, the behavior of an experiment. The difference between this last solution and the two above is evident: while in the two first the students face real devices behavior with all their difficulties, the last one is only a mimic of the real world in the screen of a computer showing the expected result of the physical laws but not the difficulty inherent to real experimentation.…”