If you're worried about the world, here’s reason to be hopeful -- and keep worrying

The welfare of humankind has never been better, according to psychologist Steven Pinker, but whether it continues to get better depends on making collective wellbeing our goal and using science...

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JUDY WOODRUFF: There are many days when news events can be overwhelming and even lead toa pessimistic sense of the world, especially after tragedies like the shooting in Florida.But it may help to take the much longer view.And that's the focus of a conversation our economics correspondent, Paul Solman, hastonight.It's for his weekly series, Making Sense.STEVEN PINKER, Author, "Enlightenment Now: The Case for Reason, Science, Humanism, andProgress": Despite what you read on the news, humanity has been getting better off.PAUL SOLMAN: That's right, better, psychologist Steven Pinker insists.STEVEN PINKER: All too often, something happens.There's a terrorist attack, there's a horrific killing, there's a m...