A version of this article originally appeared in Quartz’s members-only Weekend Brief newsletter. Quartz members get access to exclusive newsletters and more. Sign up here. The stock market's genteel 9:30-to-4 workday, complete with opening and closing bells that date back to the 1870s, is becoming as anachronistic as the headsets still worn on the New York Stock Exchange floor. Now Wall Street is racing to embrace the always-on ethos of cryptocurrency and prediction markets, and meet the demands of a new ...