This is what I am reading now:
Rheumatic Fever in America and Britain: A Biological, Epidemiological, and Medical History
and I ordered a few more similar titles.
I'm sure I'll annoy you with all the boring things I learn.
This one was pretty fun though:
The Killer of Little Shepherds
Murder in the 19th century.
A deranged killer. A brilliant scientist. A substantial body count. The birth of forensic science.
(and a nasty oozing head infection too!)
Plenty of obsession for everyone... even me.