The start of the PDF of the authors, better than the articles: "The pigeonhole principle: "If you put three pigeons in two pigeonholes at least two of the pige

The start of the PDF of the authors, better than the articles: "The pigeonhole principle: "If you put three pigeons in two pigeonholes at least two of the pigeons end up in the same hole" is an obvious yet fundamental principle of Nature as it captures the very essence of counting. Here however we show that in quantum mechanics this is not true! We find instances when three quantum particles are put in two boxes, yet no two particles are in the same box." That's quantum physics. Our experiences from the "big world" don't match what's going on there. The "electron" is a particle (called so for our convenience, like other particles) but it doesn't behave like anything from the macroworld. And take care finding what the "boxes" actually in this case are.