Ralph Waldo Emerson (1803-1882), perhaps best known for his essay Self-Reliance (1841), was one of America's most influential thinkers and writers. After graduating from Harvard Divinity School, he followed nine generations of his family into the ministry but practiced for only a few years.
The first menstrual period is called  menarche .. The menstrual cycle is about four weeks long, starting on the first day of bleeding and ending when the next period begins. However, it can vary greatly when a girl first starts her period. It may skip months or come several times per month in the beginning.
Periods last around three to seven days. The average menstrual cycle lasts 28 days, although itâs normal to have a cycle that's shorter or longer than this.eriods last around three to seven days. The average menstrual cycle lasts 28 days, although itâs normal to have a cycle that's shorter or longer than this.