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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