Say No to Secondhand Smoke: Color-changing "Lung" T-shirts

The reason why people call carbon monoxide the "silent killer" is that it's colorless and odorless, and can kill people secretly. Postgraduate students, Nien Lam and Sue Ngo, from New York University especially improved the silver needle poison testing method and developed a modern technology to detect poison with gauze shirts. This is really a creative and limitless invention.