Here's how it works. The scientists invented a particular polymer called PEDOT-S that could be sucked into the rose's vascular system, just like a cut flower sucks up water and plant food in a vase. Once inside, the polymer forms 'wires' inside the plant's xylem, allowing electric signals to be transmitted, but still letting the plant get the nutrients and water it needs. Plants, just like people, naturally contain electrolytes, substances that can carry an electric charge. By connecting the wires to the electrolytes, the researchers were able to create a working transistor and a digital logic gate, the basic building block of a computer system. Using a similar polymer, the team was also able to create a colored display on the leaves of a rose, making the polymer inside the leaves change color.