The big deal about the minuscule

Capital letters and Caroline minuscule in a 9th-century manuscript from the Abbey of St Gallen (St. Gallen, Stiftsbibliothek, Cod. Sang. 143)

One of the many unwritten rules of the digital age is this: don't write an email or a text message entirely in block capitals unless you're shouting at the other person or sending a distress signal across. Otherwis…