In the News

Reliability and validity - Kilogram gets a new definition

Geoff Riley

17th November 2018

Scientists have voted to change the definition of a kilogram after more than 100 years. Read about it here.

Geoff Riley

Geoff Riley FRSA has been teaching Economics for over thirty years. He has over twenty years experience as Head of Economics at leading schools. He writes extensively and is a contributor and presenter on CPD conferences in the UK and overseas.

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