Despite decades of evidence that light was a wave, Einstein proposed that it could, in fact, be a particle, showing that mysterious phenomena, such as the photoelectric effect, could be explained by his hypothesis.
În ciuda dovezilor de zeci de ani că lumina e o undă, Einstein a propus că putea fi,  de fapt, o particulă, dovedind că misteriosul efect fotoelectric, putea fi explicat cu ipoteza sa.