Text this

Number:

Provider:

CAPTCHA:

  _____    _    _    _    _     ______    _____   
 /  ___|| | || | || | \  / ||  /_   _//  |__  //  
| // __   | || | || |  \/  ||   -| ||-     / //   
| \\_\ || | \\_/ || | .  . ||   _| ||_    / //__  
 \____//   \____//  |_|\/|_||  /_____//  /_____|| 
  `---`     `---`   `-`  `-`   `-----`   `-----`

Please enter what you see:

Text this: Positioning holes on tubes to optimise energy absorption