It would appear that some 252 million years ago, deep in the heart of China, a certain plant folded its leaves for its night-time prayers. How does paleontologist Zhuo Feng (Yunnan University) know? Per an article in the journal Current Biology, he found fossil leaves with symmetrical holes running down opposite sides of the central vein. This pattern suggests that an insect munched holes up and down the leaf while it was in a folded position. It also marks the earliest evidence of such leaf-folding by plants, and we can thank an old hungry bug for providing this insight.