Islamic Empire

5 09, 2017

Medieval stained glass, eyeglasses, and modern glass

By |2019-11-06T08:08:42-08:00September 5th, 2017|Medieval, Modern, Science|Comments Off on Medieval stained glass, eyeglasses, and modern glass

Medieval glass: Islamic glass (probably Iraq, 800s AD, now in the Metropolitan Museum, New York) Medieval glass-making By the 1100s, glass-making was expanding again from West Asia; there were glassworks further [...]

19 08, 2017

Supernova – Space – Astronomy

By |2018-05-31T11:49:31-07:00August 19th, 2017|Physics|Comments Off on Supernova – Space – Astronomy

Supernova from space (thanks to NASA and the Hubble Telescope) What is a supernova? Supernovas are exploding stars. Red giant stars explode when they have used up their hydrogen and helium fuel, and converted most of their atoms to iron [...]

16 08, 2017

What is centrifugal force? Physics definitions

By |2019-03-11T05:58:01-07:00August 16th, 2017|Islam, Physics|Comments Off on What is centrifugal force? Physics definitions

Kids playing tetherball using centrifugal force Who first explained centrifugal force? When something is going straight, it always keeps going straight unless something else stops it or turns it. (The [...]

3 08, 2017

The Reconquista – Medieval Spain

By |2018-04-12T00:08:05-07:00August 3rd, 2017|History, Medieval|Comments Off on The Reconquista – Medieval Spain

Roland blows his horn for help and tries to break his sword on a rock (Chartres Cathedral) As soon as the Moors had conquered Spain in 711 AD, the descendants of the Visigoths and the Romans [...]

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