Here's one of the best, most visually compelling and most informative of the many stories, including my own, about how the markets have changed becuase of technology and why we should be worried about them. This one, titled "This is what Wall Street?s terrifying robot invasion looks like." is from Ray Kurzweil's blog, mostly about Artificial Intelligence, from one of the field's pioneers.

The rest is here:

HFT comes to dominate markets in five years, in living color