7 things to know now: Democratic brawl in Nevada; Trump vs. Kelly; anti-aging drug

Here's a roundup of news trending across the nation and world today.

What to know now:

1. Brawl in Nevada: A near brawl broke  out Saturday at a Democratic convention in Nevada as supporters of candidate Bernie Sanders threw chairs and made death threats. Sanders supporters charged the party leadership rigged the convention to take delegates away from Sanders and give them, unearned, to Hillary Clinton. Eventually, security was called at the casino where the delegates were being awarded. Tuesday will see voting in two Democratic primaries – Kentucky and Oregon; and one Republican primary – Oregon.

2. Megyn vs Donald: Fox News commentator Megyn Kelly's interview with Donald Trump will air Tuesday. Trump has tweeted and made derogatory comments about Kelly following the first Republican debate where she asked him about statements he made about other women. The interview airs at 8 p.m. on Fox.

3. Calf  euthanized: A newborn bison had to be euthanized, according to officials in Yellowstone National Park, after some tourists put the calf in the back of their SUV because they thought it was freezing to death. According to park rangers, the calf was put down after it was  rejected by its herd and kept approaching people and cars along a roadway in the park.

4. Aging drug tested: A drug that has been shown to lengthen the lives a mice is now being tested on dogs as researchers hope to attack the biggest killer  of us all, age. Scientists are looking at how the drug   rapamycin, is able to slow the aging process and, hopefully,  help humans live longer and healthier. Mice in the study lived  up to 25 percent longer lives. Researchers have seen no significant side effects from the drug, they say.

5. Testing results: A report card from a new national test that measures how well students understand technological ideas, solutions, communication and collaboration, is out Tuesday.  The results show that girls outscored boys of the same age in many categories --  doing particularly well in collaboration. It was the inaugural national test of technology and engineering skills.

And one more

Remember the end of "Mad Men," the show that centered on a New York ad agency in the 1960s? The final episode comes to an end as the  show's protagonist, Don Draper, is sitting on a hill with a group of people, meditating. Suddenly, a smile comes across his face as we hear the iconic Coca-Cola jingle "I'd  Like to Teach the World to Sing." The man who actually came up with the jingle for Coca-Cola and shot it with a group of singers on an Italian hilltop has died.  Ad man Bill Backer created the 1971 commercial that, even today,  has people  of a certain generation humming along. It's the real thing.

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