Scientists thunk the speed of light has slowed down (also they have managed to slow the speed in tests)
https://www.vice.com/en/article/8q87gk/light-speed-slowed
Rupert Sheldrake has been ragging on the scientific community for decades—among his arguments is that the “constants” of physics are not in fact constant.
Here is a brief discussion of this and similar issues:
https://www.youtube.com/watch?v=HybPD0VsFP0