Since the early 20th century, Christmas has evolved from a religious holiday to a hugely popular cultural holiday observed by Christian and secular people across the globe who gather with families, exchange gifts and cards and decorate Christmas trees. Here’s a look at the history, beliefs and the evolution of Christmas:

The U.S. Postal Service is set to open on Christmas Eve and December 26 despite an executive order from President Donald Trump.

If you're hoping for a festive skywatching surprise, Christmas week is shaping up to be more active than usual in space. Fast solar wind from a large coronal hole on the sun has already triggered minor (G1) geomagnetic storms and forecasters say unsettled conditions could persist into Christmas.

From the depravity of "Don't Open Till Christmas" to the haunting "Krampus," the best holiday horror movies have something for every genre fan. List.

Most major grocery and retail stores, including Walmart, Target, and Publix, will be closed on Christmas Day. CVS and Walgreens locations will mostly remain open on Christmas, but may operate with modified hours. Merry Christmas!

Unseasonably warm temperatures are expected across the United States this week, with many places hitting record highs and record-high lows.

A house on Michael Road in North Attleboro is brightly lit with LED Christmas lights for the holidays. The owner begins in October taking the lights and displays out of storage and testing them. It took 80 hours to complete the festive Christmas light display. (Mark Stockwell/Boston Herald)

Just hours away from Christmas, many people are still out and about making sure they have all the presents Santa isn’t getting crossed off the list.

What actually constitutes a white Christmas depends on where you’re celebrating. In the United States, the National Weather Service sets a bar: at least one inch of snow must be on the ground on Christmas morning, or at least one inch must fall during the day. To the north, Canadians have a slightly different measure.

Is "Die Hard" a Christmas movie? What's the most annoying Christmas song and is Elf on the Shelf creepy? Here's where Americans stand on hot holiday topics.