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dopant
'dopant' - used as a noun
1. something added in trace amounts to a semiconductor to produce the desired electrical properties
 
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Who Said that ?
If one morning I walked on top of the water across the Potomac River, the headline that afternoon would read: "President Can't Swim." - Click here to find out.
Fact of the day
The stomach of an adult can hold 1.5 liters of material.