While letting the TV series, 'Through the Wormhole', drone on in the background today, I was reminded of a puzzlement that's been itching in the back of my head for decades. Through the Wormhole is light on details, but a smorgasbord of interesting concepts, many of which involve gravity. Nearly all physicists and cosmologists refer to gravity as either a force or field. I always thought it was an effect. Didn't Einstein define gravity as an effect caused by mass warping space-time? So would not the search for gravitons, or the gravitational field, be as futile as looking for the little gray particles that makeup a shadow? Was Einstein wrong, or have I misunderstood him all these years? .