Biography is one of the most satisfying of documentary types, and this week finds a trio of excellent offerings.

“Ethel” is an intimate, personal look at a celebrated American, Ethel Kennedy, directed by Rory Kennedy, her accomplished documentarian daughter.

Aviva Kempner’s two-disc “The Life and Times of Hank Greenberg” tells you everything you need to know about the great Detroit Tigers slugger, baseball’s first Jewish superstar.

Equally comprehensive, albeit by nature funnier, is Robert Trachtenberg’s “Mel Brooks: Make a Noise,” in which the comedy mastermind does what he does best: make us laugh.

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