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.

Yeah, but I can see how it makes great headlines and helps them get grant money!

Spinach Leaf was not transformed into "beating human heart tissue", however impressive the development.

nat geo is a sad shadow of its former self, more of a buzz-feed/reader's digest of nostalgic, creaky, clickbait