Humans can't digest grass...it didnt evolve until around 50 millions years ago. It didnt even exist when the dinosaurs were alive. It's hard to imagine a world with no grass...les would be devastated.
I just felt like throwing out some random facts about the wonderful world of grass. Grass and les miles go hand-in-hand, right?
The reason humans can't digest grass is because it is made of a strong fibrous compound known as cellulose. Cows can digest it, but it takes 4 stomachs to do it.