Vitamin D is often referred to as the "sunshine vitamin" because our bodies can produce it in response to sunlight exposure. When our skin is exposed to sunlight, it synthesizes vitamin D, which is important for bone health and various other bodily functions.

The Harappan civilization was characterized by its well-planned cities and advanced infrastructure. Some of the major cities of the Harappan civilization include:

1.            Harappa: Harappa was one of the first cities to be excavated in the 1920s and gave its name to the entire civilization. It is located in present-day Pakistan and was a significant center of the ancient Indus Valley civilization.

2.            Mohenjo-Daro: Mohenjo-Daro, meaning "Mound of the Dead," is another major city of the Harappan civilization, located in present-day Pakistan. It was one of the largest and most advanced cities of its time, featuring complex urban planning and sophisticated drainage systems.

3.            Kalibangan: Kalibangan is located in present-day Rajasthan, India. It is notable for its unique fire altars and is an important archaeological site belonging to the Harappan civilization.

4.            Lothal: Lothal is situated in present-day Gujarat, India. It was a vital trading center, known for its advanced dockyards and extensive trade connections with other civilizations.

5.            Dholavira: Dholavira, located in the Rann of Kutch in present-day Gujarat, India, is known for its intricate urban planning and large water conservation systems. It is one of the five largest Harappan sites in the Indian subcontinent.

6.            Rakhigarhi: Rakhigarhi is one of the largest sites of the Harappan civilization, located in present-day Haryana, India. It is still being extensively studied by archaeologists and has provided valuable insights into the life and culture of the ancient Indus Valley people.

These cities, along with numerous smaller settlements, formed the backbone of the Harappan civilization, showcasing their advanced urban planning, architecture, and social organization.