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 ______     ______   _    _      ___              
|      \\  /_   _// | |  | ||   / _ \\      ___   
|  --  //   -| ||-  | |/\| ||  / //\ \\    /   || 
|  --  \\   _| ||_  |  /\  || |  ___  ||  | [] || 
|______//  /_____// |_// \_|| |_||  |_||   \__ || 
`------`   `-----`  `-`   `-` `-`   `-`     -|_|| 
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Text this: Progress on triboelectric nanogenerator with stretchability, self-healability and bio-compatibility