Medical & DNA
So you're interested in the medical side of history. Whether you're looking for those who were in the medical profession, information on causes of death, along with diseases and ailments, researching family medical history, and of course DNA there are resources available.
If DNA is new to you, but you're interested, have a read of the Beginners Guide to DNA and Genealogy and Genetic Genealogy and DNA Testing for Beginners articles.
And for links the to DNA testing companies:
23andMe - https://goo.gl/6hT78U
AncestryDNA - https://goo.gl/3AxNDZ
Family Tree DNA - https://goo.gl/gckJbV
Living DNA - https://goo.gl/ev7k3R
MyHeritage DNA - https://goo.gl/HeESjg