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Uber cars drop your rating to zero stars. it's a question for everyone going anywhere with cat uber has added an additional feature to its ride sharing app allowing users to seera a breakdown of the star ratings they've received from their drivers r. >> uber says they hope the new information will help you stop being an speaking of turns out new york city has the lowest average rider rating in the country maybe because so many trips are from paroled felons. toco improve your score, uber recommends being on time, not making a mess. and don't eat boiled cabbage unless you plan to shareet jannis....

Military powers within the nato alliance. and i think they're also prepared to sacrifice economically. it was, in fact, the new german chancellor who this week cancelled the nord stream 2 pipeline to russia. and think the germans have shown that they are prepared to make the necessary economic sacrifices to make putin pay for this aggression. >> global zero, richard, thank you so much. appreciate your expertise. >> thank you, fredricka. across eastern europe, the humanitarian crisis is growing worse by the day as more than 100,000 ukrainians flee the war. look at this chilling video of ukr...

Chernobyl was seized by russian forces, what concerns did you have about that? >> reporter: well, it's difficult to say. some experts have said -- of course, there is this so-called sarcophagus in chernobyl, which was used to stop the radiation that was being emitted into the atmosphere. it could be a military target. it could be a kind of very crude weapon of mass destruction. but what's really i think more broadly important is it was only 10 or 15 years ago when people like former secretary of state george schulz and henry kissinger were talking about a nuclear-free world. barack obama, when...

For nonproliferation and arms control at the national security council. and he's currently a special adviser to global zero, and international movement for the elimination of all nuclear weapons, and he joins me now. john, you and other nuclear experts, and watching life, we'll time responses to this about how freak-out should we be? what do we know about how dangerous is? how should we think about this? >> so, when i just tweeted out when i heard about this story was that we need to take a deep breath. i know there is an instinct to jump to, is this chernobyl how much endanger are we, but we ...

Be worried about nuclear war. he answered unequivocally no. but one can't help but notice that -- it's unnerving. john will stop you, at the national security and the obama administration and special adviser to global zero international elimination of all nuclear weapons. his latest commentary pieces on russia's nuclear threat. he joins me now. john, i really enjoyed your piece i. i want to start with your reaction to putin announcement about this heightened level of nuclear war. what it means, how should we interpret it? >> sure, chris, thanks for having me on. with any normal person vladimir...