Unseen Archieves on Instagram: "In 1967, doctors introduced a needle-free injection method known as the jet injector. Instead of piercing the skin with a needle, it used a high-pressure stream of liquid strong enough to deliver vaccines and medicines directly through the skin. This innovation proved especially useful during mass vaccination drives, such as smallpox campaigns, because it allowed medical workers to treat large numbers of people quickly and reduced the fear many felt toward needles

How to Give an Injection