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The horizontal fraction bar was introduced by the Arabs.
A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.
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.
Certain topical medications such as clotrimazole and betamethasone are not approved for use in children younger than 12 years of age. They must be used very cautiously, as directed by a doctor, to treat any child. Children have a much greater response to topical steroid medications.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
![Three principle forms of natural selection: (a) stabilizing selection, (b) directional selection, an](https://biology-forums.com/gallery/47/medium_33_31_08_11_2_12_07_16141450.jpeg)
![Three principle forms of natural selection: (a) stabilizing selection, (b) directional selection, an](https://biology-forums.com/gallery/47/medium_33_31_08_11_2_12_19_16181010.jpeg)