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We tend to think of chocolate as a sweet candy created during modern times. But actually, chocolate dates back to the ancient peoples of Mesoamerica who drank chocolate as a bitter beverage.

For these people, chocolate wasn’t just a favorite food—it also played an important role in their religious and social lives.

The ancient Maya grew cacao and made it into a beverage.

The first people clearly known to have discovered the secret of cacao were the Classic Period Maya (250-900 C.E. [A.D.]). The Maya and their ancestors in Mesoamerica took the tree from the rainforest and grew it in their own backyards, where they harvested, fermented, roasted, and ground the seeds into a paste.

When mixed with water, chile peppers, cornmeal, and other ingredients, this paste made a frothy, spicy chocolate drink.

The Aztecs adopted cacao.
By 1400, the Aztec empire dominated a sizeable segment of Mesoamerica. The Aztecs traded with Maya and other peoples for cacao and often required that citizens and conquered peoples pay their tribute in cacao seeds—a form of Aztec money.

Like the earlier Maya, the Aztecs also consumed their bitter chocolate drink seasoned with spices—sugar was an agricultural product unavailable to the ancient Mesoamericans.

Drinking chocolate was an important part of Maya and Aztec life.
Many people in Classic Period Maya society could drink chocolate at least on occasion, although it was a particularly favored beverage for royalty. But in Aztec society, primarily rulers, priests, decorated soldiers, and honored merchants could partake of this sacred brew.

Chocolate also played a special role in both Maya and Aztec royal and religious events. Priests presented cacao seeds as offerings to the gods and served chocolate drinks during sacred ceremonies.

The polygraph instrument has undergone a dramatic change in the last decade. For many years, polygraphs were those instruments that you see in the movies with little needles scribbling lines on a single strip of scrolling paper. These are called analog polygraphs. Today, most polygraph tests are administered with digital equipment. The scrolling paper has been replaced with sophisticated algorithms and computer monitors.

When you sit down in the chair for a polygraph exam, several tubes and wires are connected to your body in specific locations to monitor your physiological activities. Deceptive behavior is supposed to trigger certain physiological changes that can be detected by a polygraph and a trained examiner, who is sometimes called a forensic psychophysiologist (FP). This examiner is looking for the amount of fluctuation in certain physiological activities. Here's a list of physiological activities that are monitored by the polygraph and how they are monitored:

The basic components of a lie detector system

Respiratory rate - Two pneumographs, rubber tubes filled with air, are placed around the test subject's chest and abdomen. When the chest or abdominal muscles expand, the air inside the tubes is displaced. In an analog polygraph, the displaced air acts on a bellows, an accordion-like device that contracts when the tubes expand. This bellows is attached to a mechanical arm, which is connected to an ink-filled pen that makes marks on the scrolling paper when the subject takes a breath. A digital polygraph also uses the pneumographs, but employs transducers to convert the energy of the displaced air into electronic signals.
Blood pressure/heart rate - A blood-pressure cuff is placed around the subject's upper arm. Tubing runs from the cuff to the polygraph. As blood pumps through the arm it makes sound; the changes in pressure caused by the sound displace the air in the tubes, which are connected to a bellows, which moves the pen. Again, in digital polygraphs, these signals are converted into electrical signals by transducers.
Galvanic skin resistance (GSR) - This is also called electro-dermal activity, and is basically a measure of the sweat on your fingertips. The finger tips are one of the most porous areas on the body and so are a good place to look for sweat. The idea is that we sweat more when we are placed under stress. Fingerplates, called galvanometers, are attached to two of the subject's fingers. These plates measure the skin's ability to conduct electricity. When the skin is hydrated (as with sweat), it conducts electricity much more easily than when it is dry.

Some polygraphs also record arm and leg movements. As the examiner asks questions, signals from the sensors connected to your body are recorded on a single strip of moving paper. You will learn more about the examiner and the test itself later.

Detractors of the polygraph call lie detection a voodoo science, saying that polygraphs are no more accurate at detecting lies than the flip of a coin. "Despite claims of 'lie detector' examiners, there is no machine that can detect lies," reads a statement from the American Civil Libertiaes Union (ACLU). "The 'lie detector' does not measure truth-telling; it measures changes in blood pressure, breath rate and perspiration rate, but those physiological changes can be triggered by a wide range of emotions."