The massive problem of trying to fully explain what mass actually is

LAST month, I wrote concerning the problem of explaining space-time. To provide folks a sense for what I imply after I say that space-time is curved, typically I speak about a rubber sheet with a ball sitting on it. I level out that the ball causes the sheet to curve and the curvature of the sheet actually shapes the place the ball will roll. I say we will consider this as an analogy for our native star – the solar – curving space-time round it. How is the solar ready to do that? As a result of it has mass.

More and more, I believe it …