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UN headquarters is providing "the greatest geopolitical show on Earth," according to one reporter, as the world body celebrates its 70th anniversary with speeches by heads of state from all over the world. When the UN was founded in 1945, the focus was on the US and the Soviet Union. Today, it's on the US and Russia. While much has changed, much remains the same. 

Also, the discovery of flowing water on Mars sparks questions of habitability. On today's Talking Point, Donald Trump announces what he calls a "zero rate" tax plan. 

Photo: UN Photo/Amanda Voisard

Liquid Water Discovered on Mars 6 MIN, 7 SEC

Not all the water on Mars was frozen in polar icecaps billions of years ago. Photographs taken from NASA's Reconnaissance Orbiter reveal that there is liquid water, even today, on the surface of the Red Planet. That's according to a paper published today in the journal Nature Geoscience — and the finding is re-igniting an age-old question: is Mars home to some form of life? Ian O'Neill is an astrophysicist and space science producer for Discovery News.

Ian O'Neill, astrophysicist and science writer (@astroengine)

Diplomacy, Dictators and Double-Speak at the United Nations 34 MIN, 22 SEC

On the 70th anniversary of the United Nations, Presidents Obama and Putin both said today that diplomacy, not force, is the hope of the future. Each accused the other of making the world more dangerous — at the same time offering to work together to restore order in a violent world. But, while their goals may sound the same, their differences -- on Syria, Ukraine and other places of conflict -- will make agreements difficult, if not impossible. Russia may not be not the superpower the Soviet Union was, but Putin is finding ways to challenge Obama as a world leader.

Somini Sengupta, New York Times (@SominiSengupta)
Michael Crowley, Politico (@MichaelCrowley)
Julianne Smith, Center for a New American Security (@Julie_C_Smith)
James Jeffrey, Washington Institute (@washinstitute)
William Pomeranz, Wilson Center (@kennaninstitute)

Gupta on Obama and Putin trading criticism over Syria
Crowley on Obama, Putin trash-talking before their first meeting in a year

Breaking Down Donald Trump's Tax Plan 9 MIN, 1 SEC

All summer long, Donald Trump has used populist language to describe a tax plan he finally announced today. He described what he calls his "zero rate" tax plan as simple, easy, fair and "graduated so as you get up in income… the economy will grow rapidly." He continued, "This is actually a tax reduction -- a big tax reduction – including for the upper income… they'll end up doing better." So does the plan live up to his own promises? Josh Barro writes for New York Times' Upshot Blog. He's also host of KCRW's Left, Right and Center.

Photo by Gage Skidmore

Josh Barro, Host of Left, Right & Center (@jbarro)

Trump - The Art Of The Deal

Donald Trump with Tony Schwartz

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