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.
According to the Food and Nutrition Information Center of the USDA, the Recommended Dietary Allowance (RDA) for iron is 8 mg per day for males ages 19 and older, 18 mg per day for women between the ages of 19 to 50, and 8 mg per day for women ages 51 and older.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.