STOCKS TUMBLE: Here's what you need to know

The Dow dropped off for seventh straight day on Tuesday, while the S&P 500 and Nasdaq also stumbled.

Even with the falls, stocks moved less than 1% for a record-breaking 14th straight day. The Nasdaq as the biggest loser percentage-wise, with the other two indexes not far behind. Oil also continued its slide further into bear market territory.

We've got everything you need to know, but first, the scoreboard:

• Dow: 18,311.54 (-92.97, -0.51%)
• S&P 500: 2,156.74 (-14.10, -0.64%)
• Nasdaq: 5,137.41 (-46.81, -0.90%)
• WTI Crude oil: $39.59 (-0.47, -1.17%)
• 10-year Treasury yield: 1.537 (+0.041, +2.74%)

1. The third-largest health insurer in the US is losing $300 million on Obamacare a year. Following the company's earnings, Aetna CEO Mark Bertolini said that the insurer is delaying its Affordable Care Act coverage expansion and is also "evaluating" all of its existing Obamacare business.
2. Biotech giant Biogen's stock leaped on takeover reports. In a report Tuesday, The Wall Street Journal said that both Merck and Allergan were interested in acquiring the $75 billion biotech firm.
3. Auto sales disappointed. All three of the major US automakers - Ford, GM, and Fiat Chrysler - missed analyst estimates.
4. Personal income rose 0.2% in June, while personal spending rose 0.4%. Income was lower than analyst expectations, while spending was higher. Both were projected to grow 0.3%.
5. Ferrari earnings beat expectations. Earnings came in at $0.62 per share against analysts of $0.45 per share. The stock jumped roughly 2.4% for the day.
6. Stocks of three major cruise liners all fell after Zika warnings. Carnival, Royal Caribbean, and Norwegian Cruise Lines all saw their stocks decline the day after the CDC issued travel warnings for parts of Miami-Dade county, a key hub for the industry.
7. The Reserve Bank of Australia cut interest rates. Australia's central bank lowered rates by 25 basis points to 1.5%, the lowest level ever for the country.

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