Modern explosive detector can sniff a part of TNT in 200,000,000 part of air. The technique involved used xtal. and a organic sample glued in it. Some reptilian cells is the sample. Scientific discovered that certain animal cells react in presence of TNT. When the reaction between the small quantity of TNT in air and the sample is produced, the mass of xtal. suffers microchanges and oscillator suffers umbalancing.
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