We have more data on ourselves than ever before. But can we really track our way into happiness? | Samantha Floreani

Inspired by a curiosity to factcheck my own feelings, I’ve been tracking my mood: Far too often a bad day can feel like a permanent state rather than a passing experience. As it turns out, observing the little coloured emojis on my mood chart, one bad day does not, in fact, mean I am doomed to…