You can now get a flu vaccine via a 'jet injector,' which shoots it straight into your arm without a needle

A futuristic-looking jet injector can shoot this year's flu vaccine into your arm without a needle. Though it may look like something from a sci-fi movie, the PharmaJet Needle-free Jet Injector is inspired by vaccination guns that have been used since the 1960s, according to the US National Library of Medicine. The first ones were powered by electricity or foot pumps and administered smallpox vaccines. They actually played a big role in eradicating the disease. "Ultimately," the National Library...