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photochemical reaction, a chemical reaction initiated by the absorption of energy in the form of light. The consequence of molecules’ absorbing light is the creation of transient excited states whose chemical and physical properties differ greatly from the original molecules. These new chemical
Today is the fiftieth anniversary of Britain’s adoption of decimalisation.
From having 240 pennies to the pound, twelve pennies to a shilling and twenty shillings to the pound we moved – not quite overnight – to the system we know now.
Generations of schoolchildren breathed a sigh of relief.
It’s much easier to calculate in tens (fingers help). But a lot harder to deal with the sums involved in counting in twelves. Especially with fractions!
Sarah Jagger’s fun feature in this week’s issue is a nostalgic look back at those days.
Sarah’s article reminded me of a feature I’d spotted in an old issue of the “Friend” when we were researching for the 150th anniversary souvenir edition.