I brushed fresh jointing sand between my patio slabs every spring just to keep it neat: the day I lifted one slab, I saw what I had been feeding for years
For a decade, I maintained my patio’s neat joints with fresh sand each spring. The day I lifted one rocking slab, I discovered an elaborate ant colony thriving beneath my feet—a hidden metropolis I’d been unknowingly supplying with building materials every single year.
