RSD Academy response to a Veritasium video, previously posted here:<p><a href="https://news.ycombinator.com/item?id=29281060" rel="nofollow">https://news.ycombinator.com/item?id=29281060</a>
We don't actually know if the Poynting vector is correct. You can add terms pretty freely without violating the constraints. The only way to determine would be via measuring the gravitational impact of high energy waves which poses some experimental difficulties.