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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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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.

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

Play provides these preschoolers with the ability to interact with one another, and develop their ph Play provides these preschoolers with the ability to interact with one another, and develop their ph
Long bones develop from several bony centers--one for the shaft and at least one for each end. The e Long bones develop from several bony centers--one for the shaft and at least one for each end. The e
By age 3, children develop scripts for common events such as eating at a restaurant. By age 3, children develop scripts for common events such as eating at a restaurant.
Men experience more trauma in their lifetimes, but women are more likely to develop PTSD. Men experience more trauma in their lifetimes, but women are more likely to develop PTSD.
How Cities Develop: Models of Urban Growth How Cities Develop: Models of Urban Growth
Days 24–25 Pharyngeal arches develop. They will contribute to the face, neck, larynx, and pharynx. Days 24–25 Pharyngeal arches develop. They will contribute to the face, neck, larynx, and pharynx.
Video: Structure of a Ribosome

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