Cyber Day assignment

As you already know, all great civilizations have three things in common: specialized workers, large populations, and advanced technology.  The ancient Egyptians certainly had their share of technological breakthroughs, and they are credited with many different inventions which allowed them to advance as a civilization. 

Your assignment is to find five different technological developments of the ancient Egyptians, using the sites below.  (Don't use Wikipedia this time around; just use any or all of the five sites I have provided.)  Using complete sentences, and in your own words, describe these inventions/breakthroughs, including why they were important and how they improved life for the Egyptians.  Rank these by importance, starting with the one you feel was most important.


Sun clocks: It used the shadow of a kind of sundial to perform the time of one day. And it also divided one day by two part, morning and afternoon. It can also show the shortest day and the longest day in a year.
Water clock: Early water clock use a stone vessel with a little hole at the bottom, the water inside will drop nearly constant speed. And more elaborate kind of water clock developed between 100 B.C.to 500 A.D. 
Empire: It brought Egypt tremendous wealth and power. And also, some of these legacy remained 3000 years later.
Ancient medicine in Egypt: Most of those knowledge came from the papyrus document. When doctors and priests could not explain why the sickness happened, they preferred to belief god. 
Egyptian Hieroglyphs: It is the history of Egyptian writing and mathematics.There are 1000 glyphs,  400 Egyptian word and 500 hieroglyphs.
The astronomy of Egypt: Egypt first named one year as 365 days and divided into 12 months and one month is 30 days,