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Jocker
 
93%
The idea is to create a portable ultrasonic detector that will use non-invasive technology to check gold bars for flaws or signs of counterfeiting. The device will use computer controlled phased array probe to produce easy to read images that even untrained personnel can interpret.
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Adam
 
93%
08/15/2010
Cleaning and caring for silver jewelry is simple to do if you follow a few basic rules. Your silver jewelry should always shine with a little care and maintenance. When you buy silver jewelry, the first thing to remember is that silver is a soft metal. Even a heavy silver ring will bend if enough force is added to it, i.e. you should take off your ring before lifting anything heavy. Another thing to bear in mind is how you store your jewelry when it is not being worn....