Did our brains evolve to follow celebs?

I love a good quote. 

One of my all-time favourite quotes comes from Mark Twain, who once wrote to his friend "I am sorry for the length of this letter, but I did not have the time to write a short one". 

It's an apology I have often repeated in bloated ramblings to my friends and colleagues, and it's a wonderfully wry, pithy insight. Typical Twain, you might say. 

Except that it's not. Because, as the person who recently pulled me up for using it told me, the true author of the quote is in fact a less well-known French thinker, Blaise Pascal, who coined it in a letter to a colleague in 1657. I looked it up and they were absolutely right. 

And it turns out not to be the only quote I've been abusing. 

I'm sure most of you are familiar with Einstein's brilliant refrain: "The definition of insanity is doing the same thing over and over again and expecting a different result." It's probably the most famous thing he said, apart from "E=mc2".

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