It’s weekends and holidays, child labor, and workers compensation
Centrists like to think they made all those things happen and their existence is proof that triangulation on every issue works. The history of workers comp is pretty interesting if you havent read it yet:
https://arawc.org/blog/the-interesting-history-of-workers-compensation/
radio waves dont have mass but do have relativistic mass. And you didnt clarify whether relativistic mass counted, so I'm going to go with radio waves. They travel at the speed of light. I am the winner. I'd like my nobel prize in literature now.