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Monday has often been called ablue day. There is considerable speculation as to why this might be so. One theory runs that Monday (before the advent of the washing machine) was the usual day for washing and a blue dye was frequently used to keep clothes from yellowing. Blue is also frequently associated with depression. Since Monday is typically the first workday of the week and workers must look over a long depressing stretch of time until their next day-long break it has often been refered to as a blue day.

Many cultures see Monday also as an unlucky day, even as a day when people become insane. This may have something to do with the day's association with the moon. The moon has been called inconstant, due to its tendency to wax and wane. The Latin word for moon comes even into our own language to designatelunacy.

There are several holidays traditionally held on Monday, Labor Day, Memorial Day, President's Day, Martin Luther King Day, Columbus Day, Veteran's Day.