Most male fin and blue whales sing at around 17 to 18 hertz, which is too deep for humans to hear, but the 'lonely' whale communicates at 52 hertz. When more recordings were released in the nineties, Dr Watkins studied the 52 hertz whale more closely.
The average person needs to absorb just a small amount of iron each day to stay healthy (around 1 mg for adult males and 1.5 mg for menstruating females). To achieve this, however, we need to consume several times that amount. This is because our bodies absorb only a fraction of the iron contained in the foods we eat.
Adolescent and adult males need 10 milligrams of iron a day, while adolescent and adult females need slightly more, 10 to 15 milligrams a day. If you are pregnant, iron is especially important for your baby's fetal growth. Pregnant women need 30 milligrams of iron a day; breast-feeding women need 15 milligrams daily.If you have an iron deficiency, treatment is usually 50 to100 milligrams of elemental iron taken three times daily for at least two months to reverse anemia.hildren ages 4 to 8 need 10 milligrams a day, and children ages 9 to 13 need 8 milligrams a day. If your child has an iron deficiency, treatment is usually 4 to 6 milligrams of iron per kilogram of weight, divided into three doses a day.