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Positive Charge Videos by Popular

How Do Photocopying Machines Work?

02/22/12
Photocopying machines are fairly complicated devices, but the basic principal is pretty simple. tags: Content_Typecopy_machinedark_powderEducationelectrical_chargelenseslight

Why Soap And Hard Water Don't Mix

05/24/11
Have you had to scrub your bathtub to get rid of soap scum Learn why soap doesn't dissolve in your water. tags: calciumchargechemistryContent_TypeEducationhard_waterlimestone