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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.
And here come the conspiracy theories...
No joke. The first thing that popped into my mind when reading the title was: "great, now my father will be afraid to do an ultrasound test"
Now you can be ultrasounded while walking down the street! You wont even notice.