Even the largest avalanche is triggered by small things.

We humans have millions of years of evolutionary baggage that makes us regard competition in a deadly light.

Technical people don't make good slaves. Without their wholehearted cooperation, things fall apart.

We will soon create intelligences greater than our own ... When this happens, human history will have reached a kind of singularity, an intellectual transition as impenetrable as the knotted space-time at the center of a black hole, and the world will pass far beyond our understanding.

Politics is good; when it works properly, disagreements get solved without people beating each other up. But when a regime knows its days are numbered, there's always the chance it may use its position to change the rules and make the debate it is losing irrelevant.

Here I had tried a straightforward extrapolation of technology, and found myself precipitated over an abyss. It's a problem we face every time we consider the creation of intelligences greater than our own. When this happens, human history will have reached a kind of singularity - a place where extrapolation breaks down and new models must be applied - and the world will pass beyond our understanding.

The physical extinction of the human race is one possibility.