Most Used Websites Websites-
Wikipedia- https://en.wikipedia.org/wiki/Main_Page
travel China Guide- http://www.travelchinaguide.com/intro/focus/inventions.htm
How Stuff Works - http://science.howstuffworks.com/innovation/inventions/10-ancient-chinese-inventions1.htm
YouTube video - https://www.youtube.com/watch?v=Yb1CcvqJ0gc / youtube.com
Enchanted Learning - http://www.enchantedlearning.com/subjects/greatwall/Emperor.html
YouTube video - https://www.youtube.com/watch?v=Yb1CcvqJ0gc / youtube.com
Enchanted Learning - http://www.enchantedlearning.com/subjects/greatwall/Emperor.html