This photograph is an example of developed drainage in Indus Valley civilization.
Indus Valley civilisation is credited with developing the science of Hydrology. They also made proper drainage and irrigation canals based on river flow and rainfall. It was a new science developed.
the Library of Alexandria refers to a huge library in the city of Alexandria on the coast of Egypt, which was burned down at some point of time.
This library perhaps contained works of a number of scholars of the ancient times which had been preserved there.
Almost all ancient civilizations have developed their own astronomy. It seems as if it was their primary science and understanding the night sky was their goal.
They have developed complex mathematics just to understand the mechanics and motion of moon, sun , planets and stars.