Two letters written by Albert Einstein to his friend Michele Besso are to be auctioned by September 28 and the bidding starts at 60,000.
One letter outlines Einstein's early thoughts on a grand unified theory of physics. This was written in Berlin on September 5, 1929. The other letter is dated April 15, 1950 and in this epistle Einstein wonders what can be known and whether some physical theories can be proved definitely.
This signed Albert Einstein letter was written on April 15, 1950.
Credit: Nate D. Sanders Auctions
The bidding for each letter starts at $60,000. Sam Heller, a spokesman for the auction house, said the letters came from a private collection, whose owner didn't want to be identified.