How to Explain Air Gun Blog to a Five-Year-Old

http://israelefbw091.jigsy.com/entries/general/a-trip-back-in-time-how-people-talked-about-otw-red-dot-sight-20-years-ago

A gun is usually a ranged weapon ordinarily meant to pneumatically discharge projectiles[1] that happen to be solid (most guns) but can also be liquid (as in h2o guns/cannons and projected water disruptors) or