Science News: A new gel has been developed that causes blood to clot and could substitute for the use of stitches. Developed by biomedical engineer Brendan Casey of the University of Maryland, College Park and colleagues, the substance is a gelatin-like mixture of water and a fibrous polymer. The research team, who reported their results on 23 August at the American Chemical Society’s fall meeting, thinks that it may be the polymer’s positive charge that induces the clotting.