https://towardsdatascience.com/getting-started-in-r-markdown-2d3de636bde3
https://knowledge.wharton.upenn.edu/article/whats-mine-consumption-changing/?utm_source=kw_newsletter&utm_medium=email&utm_campaign=2021-03-02
https://theconversation.com/la-esencia-de-la-teoria-de-la-relatividad-de-einstein-219656