Just in case we get thrown back into the Stone age – here are some videos to memorize
This guy show how you can build a house, make tools and weapons without any modern tools. House Bow and arrow Knife (sort of) Iron from sand And many more on his channel: https://www.youtube.com/channel/UCAL3JXZSzSm8AlZyD3nQdBA Who knows? Might come in handy. …