What useful modern invention can be easily reproduced in the 1700s?

1. Pasteurization?
   — LesterPearsonsProjct


2. A pizza. Took them till 1889 before they made a pizza.
   — Hesoner


3. Apparently the only right answer to this question is "modern metallurgy" since it's required for pretty much everything else.
   — -RagnarDanneskjold-






4. Nice try, Traveler but don't fuck with timeline 87.
   — ArthurOrton


5. Hygiene
   — TeslaMust


6. the first plane ever made of sticks, ropes and paper
   — AnonCaptain002






7. Take a monk's robe, turn it around and BOOM! You got yourself a Snuggie.
   — ZarquonsFlatTire


8. Onion rings
   — FreshYoungBalkiB


9. Pet rock
   — MaaJ_






10. Bread has existed for like 10,000 years and they waited until the 1920's to slice it
    — kungfukenny3