The whole series split in parts:
Part 1
http://youtube.com/watch?v=rUHNp2vkA1g
Part 2
http://youtube.com/watch?v=GT9sb6V9awk&...ted&search=
Part 3
http://youtube.com/watch?v=MtKKgRmvw3E&...ted&search=
Part 4
http://youtube.com/watch?v=i0W7KEVeBJ8&...ted&search=
Part 5
http://youtube.com/watch?v=OjgLkfS8p_E&...ted&search=
Part 6
http://youtube.com/watch?v=aF4aD9keVZ4&...ted&search=
They did not mention Gunpowder and Paper. ridiculous