Before Papa left for Fort Smith he arranged for a colored man named Yarnell Poindexter to feed the stock and look in on Mama and us every day.

NPR: Excerpt: 'True Grit'

It allows users to pick and add stocks that interest them in to the main feed and then provides in-depth information about each selected stock with a simple series of clicks.

FORBES: Can Sentigo's Wall St. Scanner Make You a Better Investor?

London Stock Exchange confirmed it had a fault in its electronic feed that sends the prices to dealers, but it has given no further explanation.

BBC: London shares chaos