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Evidence of glass during the chalcolithic has been found in Hastinapur, India. [24] 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] [25] Glass discovered from later sites dating from 600 to 300 BCE displays ...
Here are 10 interesting facts about Earth Day. Earth Day was created by a senator. Gaylord Nelson, a Democratic senator from Wisconsin, was growing increasingly concerned over the state of the U.S ...
The study found that the room temperature viscosity of this glass was roughly 10 24 Pa·s which is about 10 16 times less viscous than a previous estimate made in 1998, which focused on soda-lime silicate glass.
1450s – Cristallo, a clear soda-based glass, is invented by Angelo Barovier; 1540 – Vannoccio Biringuccio publishes first systematic book on metallurgy; 1556 – Georg Agricola's influential book on metallurgy; 1590 – Glass lenses are developed in the Netherlands and used for the first time in microscopes and telescopes
Earth day went global in 1990. About 20 years after the concept of Earth Day was created in the 1970s, the campaign began to spread internationally. The 1990 Earth Day demonstration included ...
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 ...
The Clean Water Act was passed two years later. When was Earth Day created? The first Earth Day was held April 22, 1970. The date was chosen because it fell between Spring Break and final exams ...
A variation of this analogy instead compresses Earth's 4.6 billion year-old history into a single day: While the Earth still forms at midnight, and the present day is also represented by midnight, the first life on Earth would appear at 4:00 am, dinosaurs would appear at 10:00 pm, the first flowers 10:30 pm, the first primates 11:30 pm, and ...