“The world of the happy man is a different one from that of the unhappy man,” philosopher Ludwig Wittgenstein wrote in 1921 – and it turns out he was right on the money, according to neuroscientific research published 99 years later, in July 2020.   Neuroscientists have long been aware that the human brain is less consistent than a computer: for people, the same input will not always elicit the same output. Take, for ...