Introducing to Science

Science is not merely a collection of facts, concepts, and useful ideas about nature, or even the systematic investigation of nature, although both are common definitions of science. Science is the only method that results in the acquisition of reliable knowledge. Reliable knowledge is knowledge that has a high probablility of being true because its veracity has been justified by a reliable method.

Every person has knowledge or beliefs, but not all of each person's knowledge is reliably true and justified. In fact, most individuals believe in things that are untrue or unjustified or both: most people possess a lot of unreliable knowledge and, what's worse, they act on that knowledge!

Science is a method that allows a person to possess, with the highest degree of certainty possible, reliable knowledge (justified true belief) about nature. The method used to justify scientific knowledge, and thus make it reliable, is called the scientific method. Website scienceok.com is an online magazine that deals only reliable scientific methods and presents a general practice of scientific or critical thinking.

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Human Body Systems


Acne

Acne vulgaris, the medical term for common acne, is the most common skin disease. It affects nearly 17 million people in the United States...

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Cell Membrane

The cell membrane is the outermost part of the cell, and is composed of phospholipids, cholesterol, and proteins. This membrane is...

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The Triglycerides

The triglyceridesmake up themajority (95 percent) of the lipids in food. The structure of these molecules, with its high number of carbon-carbon bonds...

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The Circulatory System in Humans

The Blood

Blood is more than just a simple, red liquid. It is actually a clear, somewhat gold-colored, protein-rich fluid crowded with red and white cells. The preponderance of red cells gives it the scarlet cast. When separated from the rest of the blood, the clear fluid, called plasma,has a more watery consistency.

Blood Pressure

Blood pressure is a key force driving the blood through the arterial system. Blood leaves the heart in the systemic circulation under a very high pressure caused by the heart’s contraction. On average, the blood pressure in the aorta reaches 120 mmHg following a heartbeat, then falls back down to 80 mmHg before the next heartbeat. This is often written as 120/80 mmHg.

Blood Plasma

The circulatory system reaches just about everywhere in the human body, so the volume of plasma is fairly high. In fact, plasma makes up about 5 percent of a normal human’s body weight. Plasma itself is a solution of about 90 percent water.

The Jugular Veins

The head and neck region have several major veins, but the most well known are the jugular veins, which accept blood from the brain, face, and neck.

Acupressure Medical Therapy

Acupressure is a form of touch therapy that utilizes the principles of acupuncture and Chinese medicine. One of the oldest text of Chinese medicine is the Huang Di, The Yellow Emperor’s Classic of Internal Medicine, which may be at least 2,000 years old.
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