What on earth have worms got to do with Parkinson’s? Well, Dave’s not just any worm. He’s a C. elegans worm, and he’s actually just a millimetre long. Despite being a tiny invertebrate, Dave has 302 nerve cells, eight of which are just like the ones in the brain affected by Parkinson’s. And by studying these cells, scientists hope to learn more about Parkinson’s and how it develops.