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  2. History of glass - Wikipedia

    en.wikipedia.org/wiki/History_of_glass

    Evidence of glass during the chalcolithic has been found in Hastinapur, India. [19] The earliest glass item from the Indus Valley civilization is a brown glass bead found at Harappa, dating to 1700 BCE. This makes it the earliest evidence of glass in South Asia. [3] [20] Glass discovered from later sites dating from 600 to 300 BCE displays ...

  3. Glass - Wikipedia

    en.wikipedia.org/wiki/Glass

    A glass building facade. Glass is an amorphous (non-crystalline) solid.Because it is often transparent and chemically inert, glass has found widespread practical, technological, and decorative use in window panes, tableware, and optics.

  4. List of environmental dates - Wikipedia

    en.wikipedia.org/wiki/List_of_environmental_dates

    National Bird Day: January 5 International Zebra Day: January 31 World Wetlands Day: February 2 World Ostrich Day [3] [4] February 2 World Marmot Day [5] [6] February 2 World Pangolin Day [7] [8] Third Saturday of February World Whale Day [9] Third Sunday of February World Bonobo Day [10] [11] [12] February 14 World Lizard Day [13] [14] February 8

  5. Earth Day - Wikipedia

    en.wikipedia.org/wiki/Earth_Day

    Earth Day is an annual event on April 22 to demonstrate support for environmental protection. First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network) [1] including 1 billion people in more than 193 countries. [1] [2] [3]

  6. History of optics - Wikipedia

    en.wikipedia.org/wiki/History_of_optics

    It has been proposed that glass eye covers in hieroglyphs from the Old Kingdom of Egypt (c. 2686–2181 BCE) were functional simple glass meniscus lenses. [40] The so-called Nimrud lens, a rock crystal artifact dated to the 7th century BCE, might have been used as a magnifying glass, although it could have simply been a decoration. [41] [42 ...

  7. The 300-plus-year-old glass onion bottles were discovered from ... 2016 documentary following modern-day treasurer ... Working in retirement could slash your Social Security by $239 per month in ...

  8. Ancient glass trade - Wikipedia

    en.wikipedia.org/wiki/Ancient_glass_trade

    From its Indian origins, glass beads spread as far as Africa and Japan, sailing with the monsoon winds, hence their being referred to as 'trade wind beads'. [19] The most common compositional type, representing 40% of the glass finds for the region, is known as mineral soda-alumina glass [20] and is found from the 4th century BC to the 16th ...

  9. Joseph von Fraunhofer - Wikipedia

    en.wikipedia.org/wiki/Joseph_von_Fraunhofer

    Joseph Ritter von Fraunhofer (/ ˈ f r aʊ n ˌ h oʊ f ər /; German: [ˈfraʊnˌhoːfɐ]; 6 March 1787 – 7 June 1826 [1]) was a German physicist and optical lens manufacturer. He made optical glass, an achromatic telescope, and objective lenses.