In all the vastness of the universe, we are alone. Three millennia of searching and not a sausage, not even microbes. Theory says life should be common. So, why? Why does no-one answer us?
The solution, I think, lies in dark matter. This, too, we sought for thousands of years without explanation. Two mysteries? Or, maybe, one?
The only remaining possibility is that dark matter is the gravitational effect of adjacent universes.
Yesterday, we finished the test—collided two galaxies together, then four, then eight. If there’s anyone in the universe next door, maybe they’ll hear our message and tap back on the wall. The reply should be “sixteen”.