<https://secure.gravatar.com/avatar/90c0f3ece723bfb3bab088903141d7e2?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://batterytools.net/what-is-the-function-of-sulfuric-acid-in-car-batteries/>