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.
For men that are 19-50 years old, 8 milligrams per day is the requirement. For women that are 19-50 years old, the requirement is 18 milligrams per day due to the loss of blood, as well as iron, through monthly menses.or instance, a male between the ages of 19-30 years old would need 8 mg/day. A female between the ages of 19-30 years old would need 18 mg/day. While these are great guidelines, some individuals require additional iron due to an increased risk of iron deficiency.