Polycyclic aromatic hydrocarbons, toxic air pollutants produced by combustion, are linked to lung cancer and other serious health problems. Recent findings suggest that these tiny particles travel long distances and significantly increase overall health risks.
Photographer Wing Young Huie created a huge portrait exhibit on the outside walls of the History Theatre in St. Paul, Minnesota. He grappled not just with his subjects’ family histories, but his own, too.
Two Coptic churches were bombed in Egypt on Sunday. The explosions occurred as worshipers had been celebrating Palm Sunday, one of the holiest days of the Christian calendar. Egyptian officials have denounced the attacks and Pope Francis sent his "deep condolences."
Ocean floor expeditions near the site of the 1979 Ixtoc oil blowout seek to find out how the ocean is recovering three decades after the disaster. Scientists hope their work will shed light on the future of the waters near the Deepwater Horizon disaster.
No one is 100 percent sure what will happen when the most powerful Chinese leader in a generation meets a mercurial American president who has been in office fewer than 100 days, as Trump and Xi open a new chapter in the world's most consequential relationship.