Many people have a small, round scar on their upper arm, a lasting mark from the smallpox vaccine, which was commonly given before the 1970s. This vaccine used the live Vaccinia virus to create immunity against the deadly Variola virus, the cause of smallpox.

After receiving the shot, “blisters appear at the injection site, which eventually heal and leave a circular scar,” explains the original article. The vaccination process involved multiple needle pricks that caused blisters, leading to a brief swelling, then a lump resembling a mosquito bite. This lump grew, oozed fluid, and eventually healed into a scar that remains.

Smallpox was eradicated in the Western world by the early 1970s, and vaccinations stopped in the 1980s due to no further risk of exposure. The scar serves as a historical reminder of a once-deadly disease.

However, the smallpox vaccine scar isn’t the only reminder of the past that still has relevance today. In fact, there are several life hacks from 100 years ago that are surprisingly useful in our modern world.

One such life hack is using vinegar as a cleaning agent. Back in the day, vinegar was a common household item used for cleaning and disinfecting. Its acidic properties make it effective at killing bacteria and removing stains. Today, many people are turning back to this age-old hack as a natural and eco-friendly alternative to harsh chemical cleaners.

Another useful life hack from a century ago is using baking soda as a deodorizer. Baking soda has been used for generations to absorb odors in refrigerators, closets, and even shoes. Its ability to neutralize odors makes it a handy tool to have around the house, especially for those looking to reduce their use of synthetic air fresheners.

One more 100-year-old life hack that remains useful today is using lemon juice as a natural bleach. Before the days of commercial bleach products, people would use lemon juice to whiten their clothes and remove stains. The citric acid in lemon juice acts as a natural bleaching agent, making it a great alternative for those looking to avoid harsh chemicals in their laundry routine.

These life hacks from a century ago may seem simple, but they are effective and can still be useful in our modern lives. Whether you’re looking to clean your home more naturally, freshen up your belongings, or brighten your laundry, these age-old tips can help you do so without relying on modern conveniences.

So next time you’re looking for a new cleaning solution or a way to freshen up your space, consider turning to the wisdom of the past. You may just find that these 100-year-old life hacks are surprisingly useful in today’s world.