My portable charger obsession
A femtosecond, derived from the Danish word femte meaning ‘fifteen’, is a unit of time in the International System of Units equal to 10-15 or 1⁄1,000,000,000,000,000 of a second; in other words one quadrillionth, or one millionth of one billionth, of a second. A femtosecond is to a second as a second is to approximately 31.69 million years. Similarly, a femmosecond, from the French femme meaning ‘wife’, is a slightly briefer unit of time equivalent to the twinkling of an eye. It defines the imperceptibly fleeting interval between my wife saying ‘Rory, why on earth have you bought another portable charger?’ and my wife saying ‘Rory, could I borrow your
