"In the 1980s it was the personal computer - came out of the garage, changed the world. In the 1990s it was the web. The next big device to wander into our lives is robots,” he told the Sunday Times. "We may find we are absolutely dependent upon these electronic insects and that we don't even know we are dependent upon them until something breaks. "I sometimes wonder if the very rich can live, on average, 20 years longer than the poor. That's 20 more years of earning and saving. Think about wealth and power and the advantages that you pass on to your children."