Me and my friend have recently (half a year ago) had a huge debate, between ourselves, about the wave-particle duality. We took sides in light being a particle or a wave. I was for particle he was for waves. At the end of a hot-filled week of arguing, the debate ended up with the acceptance of light being as both. We just couldn't decide between the Double Slit experiment and the particles known as photons. Double Slit proves the argument for waves, but what are photons then? (This was my main argument for particle light). If light is wave, then what did all the wise physicists "invent" photons for? However, recent advances with String Theory have led me to confusion, as everything, all particles, end up being waves, or to be more precise, vibrating strings. (What is meant by strings? A form of matter (a new particle) like "String"?) If it is like this, then all matter is waves. Right? Am I missing some basic information on the field? Am I not up to date with some recent, recent advances in the field? I value your opinion and help. Thank you.