bakedbeing

Painters are able to operate a brush for full working days in the studio without the elbow support that a desk supplies here. It seems if the benefit is great enough people can work up the supporting muscles through repetition.

Ah of course, a theoretical graviton being a massless particle. That's what I get for not having a wee Google first.

Only if gravity moves at the same speed as light, right? It sounds like we've been observing energy emissions (light) rather than directly observing it's gravitational impact on us.