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Metallica plays 1997 song live for first time at 40th anniversary concert

Credit: Getty Images/Tim Mosenfelder

Metallica plays 1997 song live for first time at 40th anniversary concert

Mosh pits help scientists study human behavior

Mosh pits help scientists study human behavior

More heavy metal music

Metallica plays 1997 song live for first time at 40th anniversary concert

Metallica plays 1997 song live for first time at 40th anniversary concert

Mosh pits help scientists study human behavior

Mosh pits help scientists study human behavior

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