hey, i'm 15 years old, and i'm still going to high school:) But Physics has been my main subject of study for a few years now(since i was 7 to be precise) and i understand many complex things that are above my age category such as newton's laws and vectors, projectile motions, electronic configurations and orbitals(i know that's chemistry) and i know many more things - but i had an idea, which according to Newton's Laws could work. According to Newton's 3rd law, if a force from 1 body is exerted onto a 2nd body, the 2nd body will exert a -F, which is equal in magnitude to F, but opposite in direction. So i thought, because light is made of particles and they move very fast, couldn't you propel vehicles on pure radiation instead of having cars? According to newton's law, if light moves away from the vehicle, the vehicle will evert a -F with the same magnitude but opposite in direction. Now, i realise that light's pressure would be very weak - but what if a reflecting surface was involved to double or multiply light's pressure? It's just an idea i had - and i'm 15 so don't go hard on me! But i think it's possible!