Those basic things our ancient ancestors developed that we still use - cooked food, clothing, shelter, art, and writing. All interesting subjects that archaeologists look for in their digs. Drop spindles for making thread and yarn are incredibly simple technology that may not be recognizable unless you're looking for them in a dig. Illustrated here - beads or ballast for a spindle? These Mysterious 12,000-Year-Old Pebbles May Be Early Evidence of Wheel-Like Tools, Archaeologists Say from Smithsonian late last year.

When I was an undergraduate back in the 1970s I house-sat for a friend who had a keeshond dog and a visiting friend told me she used that kind of dog hair in making wool, so for the couple of years I was there I took her bags of hair after brushing the dog. There was probably enough hair off that pooch to knit another dog. :)