The barrier built by the Qin that linked earlier walls across China's northern frontier:

One Han invention was ______________, A device that uses the position of shadows cast by the sun to tell time

Another Han innovation was this device that measures the strength of an earthquake:

The practice of inserting small needles through the skin at specific points to cure disease or relieve pain:

Under the _______ dynasty, the Chinese made several advances in art, literature, medicine and science.

A soft light highly valued fabric made from the cocoons of silkworms

A network of routes between China and the Mediterranean Sea:

Buddhism's introduction to China spread of ideas from one culture to another, this is known as ______________.

The Chinese were determined to keep their procedure for making ____________ a secret. Revealing this secret was punishable by death.