This is an impressive achievement, but the headline is way off. The leaf was not transformed into 'heart tissue' and was not 'beating.' Instead, the researcher

This is an impressive achievement, but the headline is way off. The leaf was not transformed into 'heart tissue' and was not 'beating.' Instead, the researchers appear to have stripped a leaf down to its cellulose structure and grown human cells on top of it to demonstrate a way of using a plant's vascular system to replace the vascular system in human tissue.