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  2. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    Crystal healing is a pseudoscientific alternative-medicine practice that uses semiprecious stones and crystals such as quartz, agate, amethyst or opal. Despite the common use of the term "crystal", many popular stones used in crystal healing, such as obsidian, are not technically crystals .

  3. Remineralisation of teeth - Wikipedia

    en.wikipedia.org/wiki/Remineralisation_of_teeth

    Tooth remineralization is the natural repair process for non-cavitated tooth lesions, [1] [2] in which calcium, phosphate and sometimes fluoride ions are deposited into crystal voids in demineralised enamel. Remineralization can contribute towards restoring strength and function within tooth structure. [3]

  4. Self-healing material - Wikipedia

    en.wikipedia.org/wiki/Self-healing_material

    Healing mechanisms vary from an instrinsic repair of the material to the addition of a repair agent contained in a microscopic vessel. For a material to be strictly defined as autonomously self-healing, it is necessary that the healing process occurs without human intervention.

  5. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio ...

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  7. Lead glass - Wikipedia

    en.wikipedia.org/wiki/Lead_glass

    Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. [1] Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal , historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. [ 2 ]

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  9. A North Carolina homebuilder is being ordered to pay ...

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    A lawyer specializing in construction can help ensure your contract is crystal clear and everything is properly documented. Review it in detail, including timeline, budget and exclusions.

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