By thronging together, they create large, liquid markets that drive down trading costs and reduce risks by allowing large deals to be handled.

ECONOMIST: London as a financial centre

The idea of using a liquid with a lower boiling point than water to drive a turbine is nothing new it has simply not proved worthwhile in the past.

ECONOMIST: Geologists are getting more juice out of the ground

Drive the stream faster and the opposite happens: liquid separates, as it would in a centrifuge.

ECONOMIST: Acoustic microfluidics