Adam Ragusea had a great video on refrigeration topic: https://www.youtube.com/watch?v=P5lu-dq7agI https://www.youtube.com/watch?v=P5lu-dq7agI How people kept s

Adam Ragusea had a great video on refrigeration topic: https://www.youtube.com/watch?v=P5lu-dq7agI https://www.youtube.com/watch?v=P5lu-dq7agI How people kept stuff cold before refrigerators (13:33)