STOCKS TANK, DOW FALLS 200: Here's what you need to know

Stocks fell well into the red for the day as earnings season kicked off with a miss.
All three indexes declined by at least 1% in trading, led by the tech-heavy Nasdaq. Additionally, oil stumbled a bit while the bond market also sold off.
We've got the headlines, but first, the scoreboard:
Dow: 18,126.40, -202.64, (-1.11%)
S&P 500: 2,136.26, -27.40, (-1.27%)
Nasdaq: 5,246.99, -80.88, (-1.52%)
WTI crude oil: $50.77, -0.58, (-1.13%)
10-year Treasury yield: 1.759%, +0.0