Describing the double-helix structure of DNA was arguably the most important scientific discovery of the 20th century. So it was a big deal when this letter, penned by one half of the duo who discovered the structure, went on sale at a New York auction. Now the letter has been sold--for $5.3 million.
Francis Crick wrote the letter to his 12-year-old son in 1953. The full transcript is here, which is worth reading just for the wonderfully understated beginning:
Watson and Crick, along with Maurice Wilkins, were later awarded the Nobel Prize for that "probably... most important discovery."
The $5.3 million bid makes this the most expensive letter ever sold at auction (previous king: an Abraham Lincoln letter sold in 2008 for $3.4 million). The buyer was anonymous, but we're assuming he or she really wanted this little piece of history. If you're looking for something cheaper, the auction house, Christie's, is also selling a series of Crick's other mementos. Bidding starts at $250,000 for Crick's Nobel medal.