A Historic Day on Wall Street, Oil Prices Plunge, and Record Lows for Yields.

<p>Turmoil on Wall Street with the Dow down more than 2000 points at the low and market-wide circuit breakers being triggered to stem some of the selling. From the NYSE to the CME and the NASDAQ, we follow all the biggest moves.</p><p>Plus, as an oil price war breaks out between Saudi Arabia and Russia, we’ll look at where oil goes from here, the impact on energy producers, and the geopolitical ramifications.</p><p>And a former Fed board member on what bullets the Central Bank still has left.</p>