**4. Conclusions**


**Author Contributions:** Formal analysis (J.I.R.-S. and E.d-.l.M.-D.l.F.); Funding acquisition (J.I.R.-S.); Investigation (J.I.R.-S.); Methodology (J.I.R.-S. and E.D.l.M.-D.l.F.); Project administration (J.I.R.-S.); Supervision (J.I.R.-S.); Validation (E.D.l.M.-D.l.F.); Visualization (J.I.R.-S.); Writing—original draft (J.I.R.-S. and E.D.l.M.-D.l.F.); Writing—review & editing (J.I.R.-S. and E.D.l.M.-D.l.F.).

**Funding:** This research was funded by the Spanish Ministry of Economic Affairs and Competitiveness (MINECO), under the Spanish Plan of Scientific and Technical Research and Innovation (2013–2016) and European Fund Regional Development (FEDER) under grant number [HAR2015-63503-P].

**Acknowledgments:** We are very grateful to the Fundación Canaria Orotava de Historia de la Ciencia for permission to use the material of Project Betancourt available at their website. Also, we sincerely appreciate the work of the reviewers of this article.

**Conflicts of Interest:** The authors declare no conflict of interest.
