In 400 AD, in his Confessiones, Augustine wrote quid est ergo tempus? si nemo ex me quaerat, scio; si quaerenti explicare velim, nescio that can be translated as What then is time? If no one asks me, I know what it is. If I wish to explain it to him who asks, I do not know. To go a little further (because often, if we are asked to explain, we have some ideas), in A Study in Scarlet by Sir Arthur Conan Doyle, published … Continue reading Interpretability and explainability of …