ScienceHow do you get 30,000 people to sign up?To play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScienceConor Dillon03/24/2017March 24, 2017One of the world's most ambitious studies is underway in Germany's largest state. Will it succeed in attracting tens of thousands of volunteers?https://p.dw.com/p/2Zu84AdvertisementInterview with Monique Breteler by Conor Dillon