One of the deepest mysteries in quantum physics is the wave-particle duality: every quantum object has properties of both a wave and a particle. Nowhere is this effect more beautifully demonstrated than in the double-slit experiment: streams of particles (photons, electrons, whatever) are directed at a barrier with two narrow openings. While each particle shows up at the detector individually, the population as a whole creates an interference pattern as though they are waves. Neither a pure wave nor a pure particle description has proven successful in explaining these experiments.
Now researchers have successfully performed a quantum interference experiment with much larger and more massive molecules than ever before. Thomas Juffmann et al. fired molecules composed of over 100 atoms at a barrier with openings designed to minimize molecular interactions, and observed the build-up of an interference pattern. The experiment approaches the regime where macroscopic and quantum physics overlap, offering a possible way to study the transition that has frustrated many scientists for decades.
The interference of waves is determined in part by the wavelength. According to quantum physics, the wavelength of a massive particle is inversely proportional to its momentum: the mass multiplied by the particle's speed. In other words, the heavier the object, the shorter its wavelength at a given speed.http://arstechnica.com/science/news/2012/03/quantum-interference-with-big-molecules-approaches-the-macroscopic.ars
Are they waves or particles? Or is wave/particle itself a bad duality? How can we go on doing anything until we know this? We don't even know what our universe is made of.
How did it start? How many dimensions exist? What is time?
Before I waste another day shopping, I want to know the answers to these questions, which are actually important.