Everything you ever wanted to know about hashtags

Back in twelfth century Italy, an entrepreneurial friar named Allessandro della Spina launched a revolutionary new product to help people see a little better. Although rudimentary by today’s standards, his ‘eyeglasses’ were a game-changer. Suddenly, smashed thumbs from errant blacksmithing irons and pricked pinkies from misjudged sewing needles became solely the domain of the clumsy. People with less than 20/20 vision could now differentiate between a tuppence and a thruppence – or the Medieval Italian equivalent – thus saving themselves a pauper’s fortune in miscounted disbursements. And b...
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