A letter written by Albert Einstein containing his E=mc² equation has sold at auction in the US for more than $1.2m (£850,000) - three times more than had been expected.
Experts say there are only three other known examples of the equation in the physicist's handwriting.
The equation was first published in a scientific paper by Einstein in 1905.
It explains the interchangeability of energy and mass.
The equation - energy equals mass times the speed of light squared - is a fundamental concept in modern physics.
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