Reply to TIL that on top of the 3 matters of state that we’re all familiar with (solid, liquid, gas), there are at least 24 more, though most only exist under extreme conditions by gianthooverpig

Reply to comment by PermaStoner in TIL about SubTropolis, a giant former limestone mine under Kansas City that was converted into the world’s largest underground business complex. The 1,100-acre complex is accessed through tunnels, and as of 2015, 1,600 people worked there. by corn_dog_22