When a stock market bubble is about to burst, financial experts start using all the same words to describe what's going on, even if - especially if - those words are positive. Groupthink doesn't get much more perilous than this.
When the world's financial giants begin creating vast artificial islands in the middle of the oceans to use as the hubs of stock-trading, it'll all be because of the speed of light.
After the "flash crash" that brought the stock exchange to its knees a few months ago, data analysis firm Nanex started looking into some odd patterns in stock trades. They discovered bot armies are affecting trades on a microsecond-by-microsecond basis.