Physicists and engineers actually are working on increasing the speed of light for fibers. https://www.nature.com/articles/nphoton.2013.45?error=cookies_not_su

Physicists and engineers actually are working on increasing the speed of light for fibers. https://www.nature.com/articles/nphoton.2013.45?error=cookies_not_supported&code=aed4a1c4-025f-404a-a995-bbd73a07833d https://www.nature.com/articles/nphoton.2013.45?error=cookie...