I’ve found the problem, but I don’t understand it. Taumoeba are getting out of the farms. But how? If there was a crack in the xenonite, the overpressure of nitrogen would’ve gotten inside and killed everything. All ten farms have happy, healthy Taumoeba populations. So what gives?

I climb down to the dormitory and have breakfast. I stare at the xenonite wall that once housed Rocky’s workshop. The wall is still there, but with a hole cut in it where I’d requested. I’m using the area mainly for storage.

I chew on a breakfast burrito, trying to ignore the fact that I’m one meal closer to coma slurry. I stare at the hole. I imagine I’m a Taumoeba. I’m millions of times larger than a nitrogen atom. But I can get through a hole the nitrogen atom can’t. How? And where did the hole come from?

I’m starting to get a bad feeling. A suspicion, really.

What if Taumoeba can, for lack of a better description, work their way around the molecules of xenonite? What if there’s no hole at all?

We tend to think of solid materials as magical barriers. But at the molecular scale they’re not. They’re strands of molecules or lattices of atoms or both. When you get down to the teeny, tiny realm, solid objects are more like thick jungles than brick walls.

I can work my way through a jungle, no problem. I may have to climb over bushes, weave around trees, and duck under branches, but I can make it.

Imagine a thousand tennis-ball launchers at the edge of that jungle aimed in random directions. How deep into the jungle will the tennis balls get? Most of them won’t get past the first few trees. Some may get lucky bounces and go a little deeper in. Fewer still may get multiple lucky bounces. But pretty soon, even the luckiest tennis ball runs out of energy.

You’d be hard-pressed to find any tennis balls 50 feet into that jungle. Now, let’s say it’s a mile wide. I can make it to the other side, but there’s just no chance a tennis ball can.

That’s the difference between Taumoeba and nitrogen. The nitrogen is just moving in a line and bouncing off stuff like a tennis ball. It’s inert. But Taumoeba is like me. It has stimulus-response capabilities. It senses its environment and takes directed action based on that sensory input. We already know it can find Astrophage and move toward it. It definitely has senses. But nitrogen atoms are ruled by entropy. They won’t “exert effort” to do anything. I can walk uphill. But a tennis ball can only roll so far before it rolls back down.