Why experiments are challenging

https://video.wixstatic.com/video/f5df24_8eac4746cace4ea18bd5a7b5c54722a1/720p/mp4/file.mp4

Here's the article: Meyer M. N., et al. , Objecting to experiments that compare two unobjectionable policies or treatments. Proc. Natl. Acad. Sci. U.S.A. 116, 10723–10728 (2019).

https://www.pnas.org/doi/10.1073/pnas.1820701116