Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast.

Since then, about 2,000 federal firefighters have been sent to Canada in rotations. As of July 17, there were 401 federal firefighters in Canada, many of them in Quebec, the agency said.

X teamed up with the Theodore Roosevelt Conservation Partnership to build a map showcasing the public lands that the Bureau ...

Ricci map - detail from a China panel. All images via Wikipedia. In 1602, the Wanli Emperor of the Ming dynasty had a big ...