Darwin's kids used now-priceless manuscript as scrap paper

Out of the more than 500 pages that make up the published version of On the Order of the Species, only 28 pages of Charles Darwin's original manuscript survive today. At least two of these later became scrap drawing paper for the 10 Darwin children. The picture above, a watercolor done on the backside of one page of Charles Darwin's seminal work, is believed to have been done by his son Francis.

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