QI lied to me, how could they

I watched an episode quite a long time ago and was facinated to hear that apparently Florence Nightingale invented bar charts.  I found it interesting that it was in the early 1800s that bar charts were first used. 

Well apparently William Playfair preceded her significantly with a published barchart in 1801, which given Florence Nightingale was born 1820 was defintely ahead of her.

QI how could you, actually I have always wondered about some of the facts that make it on to QI, perhaps I should research more.

For anyone interested in early visual representations of information then I found this site particularly interesting.

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