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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 ...
For Earth Day on April 22, interesting facts including who invented it, why it's on that date, and how it turned into a global movement. ... April 22, 2024 at 11:13 AM. ... Stash of Roman-era ...
[21] [22] Glassmaking dates back at least 6000 years, long before humans had discovered how to smelt iron. [21] Archaeological evidence suggests that the first true synthetic glass was made in Lebanon and the coastal north Syria, Mesopotamia or ancient Egypt.
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 century AD. As the name indicates, it is typically characterized by a high alumina content and was probably made by melting reh with local alumina rich sands. [21]
A 2015 study estimated that there are roughly 3 trillion trees on earth, give or take a few million. Since there are around 8 billion people currently living on the planet, the math boils down to ...
Obsidian (/ ə b ˈ s ɪ d i. ən, ɒ b-/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth.
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 ...
Did cost the Colledg a Month's discourse. [ 20 ] Diarist George Templeton Strong wrote (volume 4, p. 122) of a hazardous sudden breaking up of pedestrian-bearing ice in New York City's East River during the winter of 1867 that "The ice flashed into fragments all at once like a Prince Rupert's drop."