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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Asthma attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

The Primate order displays a diversity of ways of moving around. The Primate order displays a diversity of ways of moving around.
Johari window. Johari window.
Concentric double-pipe heat exchanger for co-current flow Concentric double-pipe heat exchanger for co-current flow
When the exhaust is lean, the PCM applies a positive current into the pump cell. When the exhaust is lean, the PCM applies a positive current into the pump cell.
To reverse the direction of operation, the polarity of the current through the motor is reversed. To reverse the direction of operation, the polarity of the current through the motor is reversed.
Find the voltage, current and power for each resistor in the circuit below Find the voltage, current and power for each resistor in the circuit below
Video: Optic Nerve and Optic Disk Animation (Part 1 of 2)

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