Why do we have margins? Rats! well, partly. People really did leave empty space around the edges because rats kept nibbling off important information. But although rodents accidentally helped inspire the habit, the margins we use today also developed for a smudge free, practical life. So yes, rats chewed on pages. But the bright red margin line? That came later, thanks to typewriters and neatness rules. Still, if you forget an assignment, don’t blame the dog. Just say the rats ate your homework!

Do you ever worry about terrible things that haven't happened yet, and may not even happen at all? Do you invent catastrophes and live anxiously in your own head? Well, Spinoza might be able to help. Here is his theory in three steps. First, Spinoza argues that so much misery is caused by despair, because despair, for Spinoza, is when we lose faith in our own ability to carry on. It's when we see and define ourselves by weakness. It's when we think that we will fail at whatever life happens to t

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