Answers to Questions Kids Ask! - Where "Why?" Turns to "Wow!"
Glass has been made by humans for about 4,500 years, and it generally consists of silica (sand), potassium or soda, lime, and occasionally some other chemicals. They are melted together and cooled at air temperature so that the material is hard, but has a smooth and flowing shape, more like a liquid. The precise recipe for glass changes from place to place — the chemistry and techniques are often closely guarded secrets.
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Word of the Daysoupbone:
soupbone: a pitcher's throwing arm.
Born on this dayOctober 25, 2016
1838 - Georges Bizet
1881 - Pablo Picasso
1934 - Joe Mercer
1936 - Sir Martin Gilbert
1941 - Helen Reddy
1944 - Fred Housego
1957 - Robbie Macintosh
1962 - Nick Hancock