Sep 04
Vaccines can be a vital way to stop the spread of disease in some parts of the world. But in underdeveloped countries, it turns out that the syringes used for vaccine injections are re-used again and again, which actually results in the spread of other dangerous conditions. To discourage this, Dr. David Swann of Huddersfield University in the UK has developed a syringe that turns bright red after use, serving as an obvious warning not to use it again.
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