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The manuscript by Albert Einstein is going under the hammer in Paris on Tuesday.
The manuscript is estimated to sell for between two and three million euros, according to Christie's, which is hosting the sale.
"This is the most valuable Einstein manuscript to ever come to auction," Christie's said in a statement.
Einstein and his friend and colleague, Swiss engineer Michele Besso, wrote the 54-page document in 1913 and 1914.
The manuscript was preserved for future use, according to Christie's.
This was "almost like a miracle" since the German-born genius himself would have been unlikely to hold on to the document, Christie's said.
The paper today offers a fascinating plunge into the mind of the 20th century's greatest scientist.
Einstein, who died in 1955 at the age of 76, is considered to be one of the greatest physicists of all time, as he made major contributions to quantum mechanics theory.
He won the physics prize in 1921 and later became a genius scientist icon thanks to his bushy eyebrows and unruly hair.
2021.
The rare Einstein manuscript was retrieved from the internet on November 21st, 2021.
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