"Confirmation of this effect supports the idea that gravity is a manifestation of space-time curvature since the flow of time is no longer constant throughout the universe but varies according to the distribution of massive bodies. Reinforcing the idea of space-time curvature is important in distinguishing between different theories of quantum gravity since there are some versions of string theory matter can respond to something other than the geometry of space-time." - Kurt Starnes

"No longer constant"? That's a terrible way to present it. - Andy Bakun

Physics World's words! I'm an not even an armchair physicist at my best. - Kurt Starnes

Andy: Today I think I understand your point. Taken literally, the phrase you quoted implies that time was constant until the discovery that it wasn't. Perhaps time is quantum mechanical and changes from constant to not constant depending on whether it's observed? :-> - Kurt Starnes