Last week we played for you the only known recording of Sigmund Freud's voice (1938). Now it's time to revive the voice of another intellectual giant, Albert Einstein. In this recording, the physicist offers the briefest explanation of the world's most famous equation, E=mc2. When was this recorded? We're unfortunately not sure. Let's just say somewhere between 1932 (a date Einstein mentions in the clip) and his death in 1955. Somewhere in those 20+ years, give or take a few. Don't miss the recently-opened Einstein archive and many free Physics courses in our collection of Free Online Courses from top universities.

Now it's time for more good culture links, all previously featured on our Twitter stream.

BBC Radio 4 Profile of William S. Burroughs Narrated by Laurie Anderson (2008)

The New Yorker Wants You to Write a Facebook Status Update for any Literary Character

The Inequality Speech That TED Won't Show You and Why

New Yorker Covers That Were Too Provocative to Print

Oxford University's Lectures on Great Writers and Why They Inspire (on iTunes)

Ancient Language Discovered on Clay Tablets Found in 2800 Year Old Middle Eastern Palace

Graphing Jane Austen: Using Science to Extrapolate the Human Condition from Victorian Literature

Roald Hoffmann, Nobel Prize Winning Chemist, Recounts His Moving Story of Hiding from the Nazis

Janis Joplin's Last Interview on The Dick Cavett Show

Time to Get Ill: Beastie Boys Lyrics in the Oxford English Dictionary

Picasso's Light Drawings: Still Shining from 1949

Albanian Refugee Works as Janitor by Day, Student by Night, Earns Columbia Degree with Honors at 52

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