This is a fun side project I've been working on now for a few years that looks back at research from 100, 150, and 200 years ago. Some stuff is well-known, others have been forgotten, and still others were never read at the time. At the very least, I hope you'll find something new and interesting!
I've had lots of great suggestions from HN readers in the past. If I've missed anything cool that you like, please share!