Subscribe Judging by the diversity of holidays observed this time of year, humans seem to have a need for a communal celebration in early winter. As the days grow shorter and cold weather grips much of the northern hemisphere, it's comforting to be reminded that sunlight and warmth (and the crops they nourish) will return. Thus, many of these festivals, from the Saturnalia of pre-Christian Rome to today's Christmas, often feature use of evergreens and lights and encourage merriment and gift-giving. Winter festivals have evolved over time, and as the centuries passed, the way people celebrate them has also changed. In previous ages, government sought to compel people to behave in certain ways when it came to religion. Theocratic European states of the Middle Ages believed there was only one "correct" expression of Christianity and forced everyone to follow the national or local model. But the right of conscience could not be squelched forever. Dissent was inevitable, and it came with righteous fury and, unfortunately, a similar spirit of religious intolerance. America's early Puritans made it illegal to celebrate Christmas, considering it "popish."