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The horizontal fraction bar was introduced by the Arabs.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
Cyanide works by making the human body unable to use oxygen.
Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.
Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.