But in the 1920s, a huge discovery in South Asia proved that Egypt and Mesopotamia were not the only early civilizations.. In the vast Indus River plains (located in what is today Pakistan and western India), under layers of land and mounds of dirt, archaeologists discovered the remains of a 4,600 year-old city.
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How Your Menstrual Works: The Natural Way Your Body Prevents Irregular Periods. Anovulation is the failure of the ovary to release eggs (or âoviumâ) over a period of time, usually exceeding three months. One of the major signs of anovulation is irregular or absent menstrual periods.