Text this

Number:

Provider:

CAPTCHA:

  _____    __   __             _    _     _____   
 / ____||  \ \\/ //   ____    | || | ||  / ____|| 
/ //---`'   \ ` //   |    \\  | || | || / //---`' 
\ \\___      | ||    | [] ||  | \\_/ || \ \\___   
 \_____||    |_||    |  __//   \____//   \_____|| 
  `----`     `-`'    |_|`-`     `---`     `----`  
                     `-`

Please enter what you see:

Text this: Wave-induced longitudinal vortices in a shallow current