What is the world's most expensive liquid? 🤔

Clip taken from QI Series Q 'Quaffing', available to stream now on BBC iPlayer.

California’s “paper” wetland restorations? One small island, a vanished Delta Smelt, and a $39M fine expose what might be the biggest eco-cover-up in the Bay-Delta.

Printer ink.

Printer ink 🖨️

Cat urine

Horse spunk?

Depends. You want science? It’s scorpion venom. Capitalism? Racehorse semen at £50M a gallon. Dystopia? Printer ink and insulin. Either way, it’s not petrol. Yet.

Thought it was printer ink? 🤔

It's not printer ink, but this still makes for a horribly expensive truck accident...

Elemental copernicium? Only a few atoms have ever been made but it is predicted to be a liquid metal like mercury above it in the periodic table. Doesn't last long either... Caveat emptor!