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.
A , Internal Medicine, answered. To replace iron lost during monthly periods, you need a diet rich in iron. In the United States, one in 10 women and girls who menstruate is deficient in iron. The recommended daily amount of iron for adult women ages 19 to 50 is 18 mg. If you are a menstruating woman, you may wish to take a multivitamin that contains iron, or check with your doctor to see if need iron supplements.