If you paid any attention in history class, then you’ve definitely heard about a species called the Neanderthals. They lived in Eurasia about 40.000 years ago and despite being extinct for a long time, it turns out there is a certain tool that they left us as a heritage gift. One Tumblr user decided to share his discovery after learning about a tool called a lissoir, which is still used by leather-workers to this day. Turns out, it was actually a leather worker himself who helped the scientists to understand what this weird tool made out of bones was.
40,000 years in use