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  2. Paradox of value - Wikipedia

    en.wikipedia.org/wiki/Paradox_of_value

    Therefore, those who want diamonds are willing to pay a higher price for one diamond than for one glass of water, and sellers of diamonds ask a price for one diamond that is higher than for one glass of water. Conversely, a man dying of thirst in a desert would have greater marginal use for water than for diamonds so would pay more for water ...

  3. History of water supply and sanitation - Wikipedia

    en.wikipedia.org/wiki/History_of_water_supply...

    The Ancient Greeks of Athens and Asia Minor also used an indoor plumbing system, used for pressurized showers. [29] The Greek inventor Heron used pressurized piping for fire fighting purposes in the City of Alexandria. [30] An inverted siphon system, along with glass covered clay pipes, was used for the first time in the palaces of Crete, Greece.

  4. Classical element - Wikipedia

    en.wikipedia.org/wiki/Classical_element

    The ancient Greek concept of four basic elements, these being earth (γῆ gê), water (ὕδωρ hýdōr), air (ἀήρ aḗr), and fire (πῦρ pŷr), dates from pre-Socratic times and persisted throughout the Middle Ages and into the Early modern period, deeply influencing European thought and culture. [5]

  5. History of salt - Wikipedia

    en.wikipedia.org/wiki/History_of_salt

    Hippocrates encouraged his fellow healers to use salt water to heal various ailments by immersing their patients in sea water. The ancient Greeks continued this, and in 1753, English author and physician Richard Russell published The Uses of Sea Water in which he declared that salt was a "common defence against the corruption of…bodies" and ...

  6. Sacred waters - Wikipedia

    en.wikipedia.org/wiki/Sacred_waters

    The Navajo and Hopi people have long embraced the water underneath and around the Black Mesa area as sacred to their people. The people have long lived around and became dependent on springs and wells of the Black Mesa. These waters are the only source of drinking water, water for livestock, and water for agriculture for the Navajo and Hopi people.

  7. Sanitation of the Indus Valley Civilisation - Wikipedia

    en.wikipedia.org/wiki/Sanitation_of_the_Indus...

    Great Bath, Mohenjo-daro A water well in Lothal Water reservoir, with steps, at Dholavira, Gujarat, India. The ancient Indus Valley Civilization in the Indian subcontinent (located in present-day eastern-Pakistan and north-India) was prominent in infrastructure, hydraulic engineering, and had many water supply and sanitation devices that are the first known examples of their kind.

  8. Spilling salt - Wikipedia

    en.wikipedia.org/wiki/Spilling_salt

    Ancient Egyptians, Greeks, and Romans invoked gods with salt offerings. Some people think this to be the origin of Holy Water in Christianity. [15] In Aztec mythology, Huixtocihuatl was a fertility goddess who presided over salt and salt water. [16] Salt is an auspicious substance in Hinduism and is used in ceremonies like house-warmings and ...

  9. Traditional water sources of Persian antiquity - Wikipedia

    en.wikipedia.org/wiki/Traditional_water_sources...

    This book mentions many qanats running at that time and irrigating a considerable area of farmland. At the same time, another book, entitled Jame’ al-Kheyrat, was written by Seyyed Rokn al-Din on the same subject as Rashid's book. In this book, Seyyed Rokn al-Din names the properties he donated in the region of Yazd.