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Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

Color-enhanced magnetic resonance image (MRI) showing a sagittal view of the head. Color-enhanced magnetic resonance image (MRI) showing a sagittal view of the head.
Anterior view of the human skeleton. Anterior view of the human skeleton.
View of the bottom surface of the human brain. View of the bottom surface of the human brain.
Cross-section view of the human eye. Cross-section view of the human eye.
microscope view of an onion root tip microscope view of an onion root tip
Jacob van Ruisdael, View of Haarlem from the Dunes at Overveen. Jacob van Ruisdael, View of Haarlem from the Dunes at Overveen.
Video: Chemical Buffers - protein buffer, phosphate buffer system and bicarbonate buffer system

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