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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.
Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.