airport security

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.