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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Limit intake of red meat and dairy products made with whole milk. Choose skim milk, low-fat or fat-free dairy products. Limit fried food. Use healthy oils when cooking.

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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

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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.

Effect of Stress on Immune Function Effect of Stress on Immune Function
Derivative of a function Derivative of a function
Graph the function by hand & label key points on graph: Graph the function by hand & label key points on graph:
Differentiation of Inverse Trigonometric Function Differentiation of Inverse Trigonometric Function
Differentiation of Inverse Trigonometric Function Differentiation of Inverse Trigonometric Function
Structure and function of the gills of a bony fish. Structure and function of the gills of a bony fish.
Video: Sister chromatids of a metaphase chromosome animation

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