<https://qz.com/760582/we-arent-meant-to-be-happy-all-the-time-and-thats-a-good-thing/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://qz.com/760582/we-arent-meant-to-be-happy-all-the-time-and-thats-a-good-thing/>