"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...."