One is a man of the Night’s Watch who guards the Wall. One is a doctor responsible for the discovery that cholera is a waterborne infection. We wish a happy 200th birthday to the latter today. 
Image: A screenshot of HBO’s Game of Thrones via A Wiki of Ice and Fire; John Snow portrait, by unknown photographer, c.1856 via ODNB. 

One is a man of the Night’s Watch who guards the Wall. One is a doctor responsible for the discovery that cholera is a waterborne infection. We wish a happy 200th birthday to the latter today. 

Image: A screenshot of HBO’s Game of Thrones via A Wiki of Ice and Fire; John Snow portrait, by unknown photographer, c.1856 via ODNB.