It's dark down there in the potting soil. There's no light, no sunshine. So how does it know which way is up and which way is down? It does know. Seeds routinely send shoots up toward the sky, and roots the other way. Darkness doesn't confuse them. Somehow, they get it right...
No, said airline security, you can't take this bottle onboard. It exceeds the 100 milliliter limit; it's forbidden.
But wait, said professor Martin Birchall of Bristol University. This is a medical container. Inside is a trachea, a carefully constructed human windpipe, seeded with 60 million stem cells from a very sick woman in Barcelona. We have just 16 hours to get it into her body. We pre-arranged this.
We have no record of your request, said the airline.