The smallpox vaccine, widely administered before the 1970s, left a lasting mark on many people’s upper arms. This vaccine used the live Vaccinia virus to build immunity against the deadly Variola virus, responsible for smallpox.The vaccination process involved a series of needle pricks that caused blisters, leading to temporary swelling, followed by a lump resembling a mosquito bite. As the lump grew, it oozed fluid and eventually healed into a circular scar that remains to this day.This nostalgic look at the past highlights the resourcefulness and ingenuity of our ancestors. Many of the life hacks and tips from 100 years ago are still surprisingly useful today, offering a fascinating glimpse into the past and its relevance to our modern lives.