Imagine that you are living in a tiny community at the base of a valley that's surrounded by mountains. At the top of a distant mountain is a giant boulder. It's been there for a long time and has never moved, so as far as your community is concerned, it just blends into the rest of the landscape. Then one day, you notice that the giant boulder looks unstable--that it's in position to roll down the mountain, gaining speed and power as it moves, and it will destroy your community and everyone in it. In fact, you realize that perhaps you've been blind to its motion your entire life.
Mar-11-2019, 01:01:05 GMT