IE 11 is not supported. For an optimal experience visit our site on another browser.

KNOW IT ALL: Tuesday's Top 7 Stories at NBC News

From the tumult on Wall Street to the latest in the presidential race, here are the top stories we're following today.

Good morning. Here are the top headlines from NBC News.

1. Dow Futures Spike Up to 500 Points After Sell-Off

U.S. stock index futures pointed to a sharply higher open on Tuesday, recovering from the plunge seen in global stocks on Monday as mayhem in Chinese markets and interest rate fears dominated markets. Read more in BUSINESS.

2. Terrorist or Train Robber? Clock Ticks on Attack Charges

Judges must decide Tuesday whether an AK-47-toting Moroccan who was tackled by fellow passengers on a high-speed train will be charged with attempting a terror attack. Prosecutors in Paris were expected to open a judicial investigation into Ayoub El-Khazzani or request an extension to his police custody. Read more in NEWS.

3. Adultery Site Faces Suits Seeking a Half-Billion Dollars

At least five lawsuits seeking class-action status have been filed over the hack of cheat-on-your-spouse website Ashley Madison, seeking more than a half-billion dollars, according to North American court records. Read more in NEWS.

4. Obama Could Endorse in Democratic Primary, White House Says

White House press secretary Josh Earnest told reporters that Obama has spoken highly of both Vice President Joe Biden and former Secretary of State Hillary Clinton. Read more in POLITICS.

5. IndyCar Driver Justin Wilson Dies Day After Crash

"Anyone who follows our sport knows Justin is one of the most highly respected people in our business. He will be missed," IndyCar CEO Mark Miles said in announcing Wilson's death. Read more in NEWS.

6. Frat Suspended During Probe Into Crass Signs

Crass, sexually suggestive banners “welcoming” freshman women to a Virginia college last week have sparked outrage and led to the suspension of at least one of the school’s fraternities. Read more in NEWS.

7. Panda-monium: Why the Twin Pandas Cubs Are Reason to Celebrate

With fewer than 2,000 pandas around the world, every new birth for this endangered species is rare and welcome news. Read more in SCIENCE.