A glass bottle would sink instead of floating if there was no air inside of it
I believe the answer is: when you do something with as little waste as possible
Maximum efficiency is achieved if you manged to obtain the maximum benefit while making the least amount of expense as possible. In managing your daily life, this could be achieved by making sure that your time is spent carefully so it give as little waste as possible.
The planet's mass in kilograms are 
b.
<u>Explanation:</u>
Given:
Mass of Neptune = 
milligrams
The mass in Kg = 1 milligram
Then the the planet's mass in kilograms will be:
The planet's mass in kilograms are .
Answer:
Public Works department sees that the streets are clean and in good repair
Explanation:
Public works department issues permits to construct, build county sidewalks and pavements. It also issues allowance for keeping banners tree planting removal, landscaping and it also takes care of the network of roads in the county and drainage system.
It is the only department which has a multi-dimensional perception in economics and politics. This department existed in the ancient past too.
It also takes care of the infra-structure of the state. Government invests a huge amount on the public sectors when there is lack of benefit from the private sector.
As far as I know, it was the Chinese - there is evidence they had movable printing press as early as in 12th century.
In Europe the movable print was devised by Johannes Gutenberg in Germany, Mainz.
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