Double split creates a wave interference pattern. Closing up one slit creates a particle like pattern (all hitting one spot). Does the closing up of one slit (allowing the particle to go through in only one narrow spot) measure its position (by the powers of Heisenburg Uncertainty Principle), then only allow the momentum (wavelength) to be random? If so, then are there different colored photons striking the photographic plate when one slit is closed? ^^And is this guy entangling another particle with his particle counter at the slit? I went online looking for that apparatus on his presentation and didn't find anything.