But when Dr Narici strapped his heel-wearers' ankles into a dynamometer, which can measure a foot's turning force, the readings were indistinguishable from the control group's.

ECONOMIST: Anatomy and behaviour

That platform is home to four sensors that measure the pressure a foot places on it.

ENGADGET: vi-RABT improves ankle rehabilitation with virtual reality and robotics

Money is a measure, just like the minute and foot are.

FORBES: Brendan Brown, and The Global Curse Of the Federal Reserve

Bottom line: Money should be a fixed measure of value, just as an hour has 60 minutes, a foot has 12 inches and a pound has 16 ounces.

FORBES: Fact and Comment