http://www.datasciencecentral.com/xn/detail/6448529:BlogPost:816795

https://gizmodo.com/ancestry-testing-company-it-s-our-moral-responsibilit-1833774781

https://treyhunner.com/2019/03/unique-and-sentinel-values-in-python/

http://generalintellectunit.net/e/031-designing-freedom/

https://towardsdatascience.com/feature-engineering-in-sql-and-python-a-hybrid-approach-b52347cd2de4

https://towardsdatascience.com/basic-time-series-manipulation-with-pandas-4432afee64ea

https://github.com/dimenwarper/chainlearn