SPECIAL MENTION: 2% of the U.S.’s 5,000 airports handle 96% of the cargo. Left out are small regional airports, which simply don’t get service. One possible solution: Xwing automated flight technology ...

The Flint, Mich., water crisis has drawn Americans’ attention to the risks associated with lead pipes and water contamination, but it’s hard to tell which homes are most in danger. That’s why ...