Star Trek's hypospray was based on (then 1960s-current) technology.
The device allowed for mass injections without the use of needles.
Star Trek's hypospray was based on (then 1960s-current) technology.
We had something in the UK known as a BCG, aimed at tackling tuberculosis, which went in two stages. First there was a multi-pronged thing (at least, in my time at school), which was some sort of prep for the actual vaccine, and then the needle. Some people but not all ended up with a scar (I was lucky, I didn't)._The idea was a hundred years old_.
A side note, but you can often guesstimate a person's age in the US by the presence of a scar on the arm. A lot of folks thought it was from the pneumatic injector device, but they were used with the Dryvax smallpox vaccine through 1972 which would cause a localized infection and was the actual source of the scar, even delivered via needle.
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