I promised to provide Calvin the answer to his question on how water pump works. He is going to love all the links I have discovered.
How Things Work - Water Distribution
This site explains the physics in everyday life. Just click on the "Select Topic" for its drop down list and click on one that is of your interest.
How It Works: Water Well Pump by Popular Mechanics has diagrams with its explanation. This could well be Calvin's favourite site as it has links to "Sciences", "Technology" and it's "How To Central" also touches on Automotive.
Here is how water pumps works in cars as cooling systems by How Stuff Works. Here is a video clip about it.
I might as well let him explore pumps in other dimensions through Wikipedia and my write up on recycled musical ware where I have posted a video of some hydraulic musical instruments installed in Ontario Science Centre.
And some water pumps do not need electricity to run. They are powered by play. Check out the Play Pump, Calvin!
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