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The researchers placed the snakes on a table across from a sheet with a projection of a black disc.

As the black disc got bigger, the snakes increased their rattling rate up to 40 hertz and then abruptly shot up their rattling frequency to 100 hertz.

Several men tried to take over a Black disc jockey’s audio equipment and beat him when he protested, The Seattle Times reported.

The indictment stems from an investigation by the Snohomish County Sheriff’s Office and the FBI of the Dec. 8, 2018, beating at The Rec Room Bar & Grill, in which a Black disc jockey was assaulted by several men when he refused to change the music.

Black disc jockeys became titans of the community.