fun facts about the tripods: the metal used on them can deflect missiles and tank shells! but it can be destroyed when a BIG bomb is detonated near the surface of it. they can work like an AI when there aren't any aliens piloting them. the horn is also made by blowing the access smoke out of their vents. the grinder inside is like a huge blender and it also acts like a fan to spray the "red weed fertilizer."