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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
![Thoracentesis. A needle is inserted between the ribs to withdraw fluid from the pleural sac at the b](https://biology-forums.com/gallery/47/medium_14755_10_09_12_7_14_27_84951238.jpeg)
![Note the thickening of the intestinal wall and the erosion of the inner lining of the ileum, often s](https://biology-forums.com/gallery/47/medium_14755_30_09_12_4_42_22_9158776.jpeg)