Researchers have discovered that an injection of microscopic tags made of a plastic-like polymer could help curb tissue damage in mice after they suffer a heart attack. They are hoping that it can one day help treat this and other problems in humans. (Read: Take the natural route to heart health – home remedies that work!) Stephen Miller at Northwestern University in Illinois and his team found a method to use microparticles made of the biodegradable polymer PLGA to tag these monocytes in mice New Scientist reported. (Read: First aid for heart attack victims) The scientists triggered the monocytes to