They met on the beach in the early morning, as the dark blue sky still hovered over the waters and the wind whipped at the dry grass on the dunes. After building a fire, the older youth drew circles in the packed, wet sand, filled them with triangles, and began to explain the angles, the measurements, the laws that ruled the division of space. The younger boy, shaved liked his companion, watched in awe. They recalled the old man in another seaside city far away who had taught them about machines, space, and the stars whenever they brought him olives, squid, ink, or wine. I wonder where it all comes from, the younger one asked. The elder looked up into the dark sky where the stars were beginning to fade. Then he gathered some sand into his palm, letting the wind carry most of it away until only a few grains were left. It began with something smaller than one of these grains of sand. What happened? There was an explosion, said the older one, his gray eyes staring through the sand, through his own palm, through the very fabric of the universe. And out of that explosion came everything—time, matter, heat, the workings of the planets and stars. The younger boy opened his mouth and then closed it as he stared intently at the sand grains by the light of the fire. One of these grains of sand could be an explosive, then. Maybe, the older one sighed, dusting off his hands. I don’t know. What are stars? the younger one asked. They are part of the explosion. It happened thousands and thousands of years ago, maybe millions of years ago, and we are still seeing it. The moon, sun, and stars are all part of the great explosion. Then they are explosives, as well! the younger one shouted with joy. Perhaps, the older one sighed. Explosives like our old city. The smoke must have risen for days. The younger one filled his hands with dry sand, throwing the grains at the sea. Then he turned to his friend and asked how many grains of sand there were in the universe. The older boy began to speak of myriads, and myriads of myriads, and myriads of myriads of myriads, writing letters on the sand to explain as he went. The young one felt as if his own head were suddenly hollow and filled with distant stars. When his friend had finished he asked him how large one star might be, and how many grains of sand it might contain. The older one ventured a guess. The younger one walked back to the surfline and stared into the paling sky. Everything is explosive, he whispered, almost breathless.