Research team at Northwestern University show that chemical sensors capable of detecting toxic vapors can be drawn with a toy pencil on paper.
![Drawing chemical sensors on paper with a flexible toy pencil](https://www.advancedsciencenews.com/wp-content/uploads/2014/01/detecting-toxic-vapours-toy-pencil.jpg)
Research team at Northwestern University show that chemical sensors capable of detecting toxic vapors can be drawn with a toy pencil on paper.
Scientists make artificial spider silk from polymer-coated nylon, which can collect water from the atmosphere with astonishing efficiency.