Answer: Cottage Industry.
Explanation:
I’m not sure this is the answer you’re looking for but!
• They create decimal system based on Hindu numerals and the zero
• Advances also made in geometry, algebra, and trigonometry.
• Astronomers built observations and measured the Earth. They also used the astrolabe, an instrument designed to measure the plot and position of stars.
Answer:
What I heard was that people in the science laboratory in china "accidently" let loose a virus that they were studying, which also led to that person in contact with it to go out and spread it without knowing. Causing the virus to spread across all the world within a few months.
That is my explanation! \_(ツ)_/