That's an easy one. We hold the same chain and the distance between us is 100 links. The chain has a curious property: its links subdivide like living cells and

That's an easy one. We hold the same chain and the distance between us is 100 links. The chain has a curious property: its links subdivide like living cells and on average 1 link takes a minute to split into 2. Thus, every minute the distance between us doubles and half hour later we'll be 1 billion times further from each other. We can replace the chain with a net or even with a 3d net.