Candidate Donald Trump called NATO 'obsolete.' Since becoming president he has reversed that view, but what he said – and didn't say – during his recent visit will not have put NATO leaders at ease.

How have state firearm laws changed over time? Over the past 27 years, some states have loosened the rules for gun owners and the gun industry, while others are getting stricter.

To the terrorist, children have become but a means to an end. Weapon and target.

The GOP was once the political home of anti-Catholicism. And the Vatican, it was believed, would use a Catholic president as a way to meddle in US politics.

Among the Christians of the Middle East, the largest number – some eight million or so – is of Egypt’s Copts. Here's their story.

More than half of American families aren't able to save a dime to cover the cost of college, and the 529 college savings plan has done almost nothing to change that.

Surveys show Trump's election is damaging America's reputation abroad, which research suggests could deal a sharp blow to US trade.

Brazil's president, who came to power after his ex-boss was impeached, now finds himself embroiled in corruption charges, which threaten to derail the economic recovery he has championed.

Readers read, viewers watch and players do. That level of engagement gives games real power to influence people both within and outside the play itself.

Energy from the sun's rays can cause skin damage and cancers. Sunscreens can absorb or reflect the dangerous UV light. Here's how it works.

It's been 80 years since this beloved landmark opened to San Francisco traffic. In the interim, technology has advanced – is there a better way to span this strait?

The CBO analysis of the new health care bill not only shows that tens of millions would lose insurance. It is a major shift in this country's attitudes and policies toward helping the poor.

We've known for years that childhood trauma can have lifelong effects on our health. It's time for medicine and public health to start addressing the problem head-on.

The Trump administration's new education budget cuts money from traditional schools and funnels it toward school choice. Is it a nail in the coffin for public education?

Children are increasingly being exposed to more violence. The impact? They could get desensitized to violence and come to believe that it is an acceptable way to solve problems.

Two atmospheric scientists explain how they weigh evidence such as ocean temperatures, wind speeds and other climate patterns to predict how many Atlantic hurricanes are likely to form this year.

President Trump's budget reportedly will slash funding for clean energy research and development. An energy expert explains the importance of government support and spotlights some key opportunities.

In the 10 years since Google Street View launched, the platform has provided ample fodder for artists, who have used it to comment on surveillance, poverty and gentrification.

Does musical taste even matter anymore? Or does a data-driven feedback loop – where what you enjoy in the past shapes what you hear today – influence what you'll like in the future?