The Secret Weapon
He also discovered a secret weapon: Diatomaceous Earth. It’s a natural powder that looks like flour to us, but at a microscopic level, it looks like shards of glass. When a roach walks over it, it cuts their exoskeleton and dries them out. It’s safe for pets but deadly for bugs.
Mark dusted the back of his cabinets with it. It’s a passive defense system. If any new scouts try to invade, they walk through the “minefield” and don’t make it back to the nest to report the location of the food. It gives him peace of mind knowing the house is defending itself.