Young's double slit experiment (part 2 - proving that light is a molecule)

Many many many years later, the same experiment was conducted on a quantum level, where individual photons of light was fired through the single slit and then finally the double slit. Normally, we can assume that the pattern recorded is random, because the photon has to go through one slit or the other and that there are no other choices. 

However, we still find the same photon interaction with the detector as if light was considered a wave. 

Credits go to Veritasium on Youtube "Single Photon Interference"

What does this mean? How is that possible? 

What happens is that the single photon splits into two, goes through both slits and interacts with itself. So basically the same photon interferes with itself to create this image. So it is both a wave and a particle

Obviously I cannot go through the super maths with you guys (I'm only 16 after all) but that is what happens. 

Quoting Dr Quantum (Cartoon Show) ~ "Mathematically it's even stranger! It goes through both slits, and it goes through neither. Then it goes through only one, and then it goes through only just the other! All of the possibilities are in superposition with each other"

Sensing that there could be something wrong with the experiment, scientists put up sensors right next to the detecting screen to note the location and trajectory of the photon as it goes through the slit. However now we only see two normal slits. As I like to say, it was our inference that made nature collapse into one single condition. Which is absolutely amazing because without us being able to see it, we can see indications that light is in a superposition with itself. We actually did this by seeing it's results and interactions with itself. This is called indirect inference. 

Isn't science mysterious yet amazing!?

Matthew Tan