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Ultrasound can push vaccines into the body without needles
(www.newscientist.com)
This is a most excellent place for technology news and articles.
If humans weren't meant to stabbed then we wouldn't be so soft and penetrable.
I do take your point though.
Lol, it's true. But if we were meant to be stabbed we wouldn't have a completely unique dangerous (occasionally it kills people) reaction to it that doesn't resemble most phobias.