glass history - film 3

Why was pottery cheaper than glass?
1. Because the raw materials for pottery were cheaper.
2. Because the training for glassmakers was much more expensive than for potters.
3. Because pots could be broken and the material could be used agains whereas glass could not be recycled.
4. Because for pottery you didn't need so much energy as for glassmaking.
Which material is used for windows in Asia?
1. glass
2. textiles
3. oil paper made out of mulberry trees
4. metal grids
Why is myopia probably the reason why Asia had no scientific revolution in the 18th/9th century?
1. Because myopia means that people couldn't read.
2. Because myopic people specialised in miniature art.
3. Because myopic people didn't like scientific research.
4. Because people didn't know glassmade lenses to correct myopia.