Why do crash helmets come in so many different shapes?
17 September 2018 01:30
The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific conceptsWhy is it that falling off a horse, falling off a bicycle, falling off a motorcycle, falling out of an aeroplane and falling off a mountain each require a different hat?Colwyn Lee, Swarkestone, Derbyshire Continue readingread full article
