I remember my Dad telling me that when he was in college in the 60s, due to the uncertainty about whether light is in essence a particle or a wave*, in one of his classes it was considered to be a particle on Mondays, Wednesdays, and Fridays, and a wave Tuesdays, Thursdays, and Saturdays, and every other Sunday.
The entry for blaster in the Star Wars databank is funny to think about, as it applies this light-as-wave vs. light-as-particle issue:
A squeeze of a trigger emits volatile blaster gas into a conversion chamber, where it is excited by energy from the weapon’s power source. The agitated gas is then funneled through the actuating blaster module, where it is processed into an intense particle beam. A prismatic crystal focuses the beam, and passes it through a refinement chamber which “galvens” the beam into its final bolt.
So you have gas being focused through a crystal? How does that work? (‘Course by then it’s a particle beam… :)
* Which uncertainty persists to the present, does it not?