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While the aphid excretory system isn’t widely studied, research so far suggests that the bugs have genes that seem similar to the ones in other insects’ Malpighian tubules.

“Every single system you have within your body — whether it’s your respiratory system, your excretory system, your muscular system — can be completed as an individual,” said Sean McDowell, a professor here at Biola University and a well-known Christian author and speaker.

"The length of a film should be directly related to the endurance of the human bladder," said Alfred Hitchcock, a man with a keen understanding of both cinema physics and the excretory system.

Studying in the basement of Cambridge University's Zoology Department, Dr Denholm doesn't just study flies: he studies cells in their excretory system.

It was like having a ticking time bomb lodged in your excretory system.