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History of glass – Who invented glass?

By |2018-05-25T17:36:54+00:00September 5th, 2017|Ancient, Science, West Asia|

Obsidian: naturally occurring glass History of glass: Glass beads from Old Kingdom Egypt, about 2700-2500 BC People have been using naturally occurring glass since the Stone Age, when they wanted an especially sharp edge on a tool or an arrowhead. Where does obsidian come from? Obsidian is a natural glass which forms when sand [...]

Mercury – Planets – Astronomy

By |2018-05-31T11:49:17+00:00August 18th, 2017|Physics|

Mercury from space Mercury is the closest planet to our Sun. At some parts of its orbit, Mercury is only about 46 million kilometers away from the sun. Because Mercury is so close to the sun, it is very hot there. It is so hot that all the carbon dioxide and oxygen has boiled away, and Mercury has very little [...]

What is silicon? Atoms, elements, chemistry

By |2018-04-24T14:46:23+00:00June 2nd, 2017|Chemistry|

Diagram of a silicon atom When a red giant star is getting older and runs out of helium fuel, it starts to convert the oxygen atoms in the star into silicon atoms. All silicon is made this way, inside a red giant star. Silicon is heavier than oxygen, because oxygen has only eight protons [...]