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An adhesive bandage with a gauze pad in the center, used to cover minor wounds.
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The first hand held machine gun and it was used to end the first world war.
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The theory is that when a person lies, the lying causes a certain amount of stress that produces changes in several involuntary physiological reactions. A series of different sensors are attached to the body, and as the polygraph measures changes in breathing, blood pressure, pulse and perspiration, pens record the data on graph paper. During a lie detector test, the operator asks a series of control questions that set the pattern of how an individual responds when giving true and false answers.
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Insulin is a hormone produced in the pancreas and it was isolated in 1922 at the University of Toronto.
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Foods kept fresh through various freezing methods invented by Clarence Birdseye.
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A device created by Garret Morgan to help guide traffic through various signals.
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Notebooks binded with spirals were created in 1924
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The precursor to the modern television invented by John Loqie Baird.
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An electrical device for shaving, with oscillating or rotating blades behind a metal guard.
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In a car the use of electromagnetic waves, lying in the radio-frequency range, for broadcasting, two-way communications, etc.
