As I do every year, I'm taking this week as a break from publishing new blog posts and will be republishing some of the most popular pos...

As I do every year, I'm taking this week as a break from publishing new blog posts and will be republishing some of the most popular pos...

Good evening from Maine where my daughters are eagerly anticipating Santa's arrival. Tomorrow morning I won't be in the mood to writ...

Blood, Concrete, and Dynamite is a new TED-Ed lesson that tells the story of the building of the Hoover Dam. The lesson explains why the da...

The Library of Congress housed hundreds of thousands of maps covering a huge array of topics from maps used by fire insurance companies to p...