And that may be the very heart of the problem. (fortune.com)
John, You have done an fantastic job of getting to the absolute heart of the problems. (religion.blogs.cnn.com)
To stop Zika's spread, a company called Oxitec is planning on expanding its genetically engineered mosquito project to try to rid areas in Brazil of the bug at the heart of the problem: the Aedes aegypti mosquito. (businessinsider.com)