A rare letter written by Albert Einstein, which includes his famous equation of relativity, is currently being auctioned off with an estimated worth of $400,000. CNN values your feedback 1.

Both letters were written to his sister, Maja Winteler-Einstein. The first was written on March 28, 1933, aboard the S.S. Belgenland on the day he renounced his German citizenship.

One of the most famous letters ever written in English is called the Bixby Letter. The story goes that in November, 1864, John A. Andrew, governor of Massachusetts wrote to President Abraham ...

Albert Einstein's famous letter detailing his inner-most thoughts on the subject of God, his Jewish faith and "man's eternal search for meaning" has sold at auction for a record-breaking amount ...

Einstein's handwritten theory on happiness sells for $1.3M 01:03. A letter written by Albert Einstein in which he writes out his famous E=mc2 equation has sold at auction for more than $1.2 ...

One of the most famous open letters of all time, writer Emile Zola’s letter entitled J’Accuse! (I accuse!) was written to then President of France Felix Faure in January 1898.

Letters started 60 years ago. The letters he’s collected over the past 60 years are the result of a curious mind who was brave enough to reach out and begin a conversation.

The letter reads as a personal condolence to Lydia, and has been praised as some of Lincoln's finest work. However new analysis has found that the letter probably wasn't written by Lincoln at all.

The famous author, who would have been 100 years old today, was best known for his novels and essays. But correspondence was where his light shone brightest.

Sunday Puzzle: 7 Famous Letters Listener Debbi Samuels of New Smyrna Beach, Fla., ... Last week's challenge: Write down the name of a country plus its capital, one after the other.