Though it doesn’t look like the ones found at a lumber yard, the earliest known chainsaw was developed by two Scottish doctors in the late 18th century. The hand-cranked tool was used for bone surgery and childbirth.

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7 Scary Surgical Instruments, Then and Now

Just thinking about scalpels, forceps, and shears is enough to make some people squeamish. But while the modern versions of those instruments are nothing to sneeze at, consider the surgical knives, gorgets, and trepans of centuries past. Those vintage tools were crude at best by modern standards,