KNOW IT ALL: Tuesday's Top 6 Stories at NBC News

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Good morning, and happy Tuesday. Here are some of the stories we're following today:

1. U.S. aims to boost airport screening for Ebola

The Obama administration is considering ramping up screenings at airports to fight the spread of Ebola in the United States. NBC News has learned that likely will mean adding CDC staffers at four major airports: JFK in New York, Newark in New Jersey, Chicago and Washington Dulles. But the administration says it does not support blocking flights from West Africa, in part because affected countries screen travelers on the way out. The move would come after a Liberian traveler infected with Ebola became the first case of the virus diagnosed on U.S. soil. Read more in HEALTH.

2. ‘Feeling well’: NBC News team returns from Liberia

An NBC News team, including chief medical editor and correspondent Dr. Nancy Snyderman, has returned to the U.S. following a freelance cameraman’s Ebola diagnosis in Liberia. “They are deemed low risk, but will be staying home and monitoring their temperature for the remainder of the 21-day period recommended by health authorities,” NBC News President Deborah Turness said in a statement. The cameraman, Ashoka Mukpo, was earlier flown to the U.S. and admitted for treatment at a Nebraska hospital Monday. “He’s enormously relieved to be here,” his mother told reporters. Read more in HEALTH.

3. ISIS makes inroads at Syrian border town

The jihadist extremists continued to push into the Syrian Kurdish town of Kobani, taking several buildings in a bid to capture the key territory just six miles from the Turkish border. In a startling display, ISIS on Monday raised its black flag above one of the buildings — signaling its ability to seize and potentially hold Kobani. A U.S.-led coalition has been bombing ISIS in Syria as well as Iraq, but the question remains whether the attacks can eradicate the terrorists. Read more in NEWS.

4. Supreme Court clears way for more gay marriage

Gay couples in five states — Virginia, Oklahoma, Utah, Wisconsin and Indiana — are allowed to be married after the Supreme Court decided Monday not to take up the issue of same-sex marriage. That essentially allowed lower-court rulings allowing for gay marriage to be upheld. While the move also leaves open the door for same-sex couples in six other states to get married, the hot-button issue still hasn’t been resolved by the justices once and for all. Read more in NEWS.

5. Money woes behind Hong Kong protests

The young protesters who’ve been occupying Hong Kong’s streets calling for more democracy say the cost of living and low employment is pushing them to demonstrate. In fact, Hong Kong is the second-most expensive real estate market in the world, behind Monaco, according to the Knight Frank Wealth Report. Another economic index says income inequality in Hong Kong is even worse than in Zimbabwe. Government leaders, meanwhile, have agreed to more talks with protest representatives to address their concerns. Read more in NEWS.

6. Michael Phelps suspended for six months

As fallout from his DUI bust, the decorated Olympian has been suspended for six months and withdrawn from the 2015 World Championships, USA Swimming ruled on Monday. “Michael has publicly acknowledged the impact of his decisions, his accountability especially due to his stature in the sport and the steps necessary for self-improvement,” USA Swimming executive director Chuck Wielgus said in a statement. Phelps, 29, earlier announced he will be entering rehab following his latest drunken driving arrest last week. Read more at NBC SPORTS.

… What’s trending today?

Oh, Canada! A skating singer took an unintended tumble while belting out the country’s national anthem during a minor league hockey game. The players could hardly keep a straight face.