After a munitions ship exploded in Halifax in 1917, Boston mobilized doctors, nurses and medical supplies and sent them north by train through a blizzard — more than a century later, Nova Scotia still sends Boston a giant Christmas tree each year in thanks

After a munitions ship exploded in Halifax in 1917, Boston mobilized doctors, nurses and medical supplies and sent them north by train through a blizzard — more than a century later, Nova Scotia still sends Boston a giant Christmas tree each year in thanks

One selfless telegraph operator's warning saved hundreds of lives—and created a debt of gratitude that an entire nation has honored for over a century.