Some of the most innocuous inventions have proven earth-shattering, with reverberations felt around the planet. The Internet is the poster child for disruptive technology, but even such inventions as Amazon's Kindle and Apple's iPod have rocked their respective industries by changing how we entertain ourselves.

All knowledge or form conception is evoked through the medium of the eye, either in response to disturbances directly received on the retina or to their fainter secondary effects and reverberations. Other sense organs can only call forth feelings which have no reality of existence and of which no conception can be formed.

I hope I'm wrong but I am afraid that Iraq is going to turn out to be the greatest disaster in American foreign policy - worse than Vietnam not in the number who died but in terms of its unintended consequences and its reverberation throughout the region.