5.Miles and Miles and Miles
4.Iron Enough to Make a Nail
Each and every healthy adult person has enough iron dispersed through their bodies (in the red blood cells predominantly, but also in various organs, such as the liver, bone marrow and spleen) to make a small iron nail. It is estimated that a healthy person should have some 4 or 5 grams of iron is their systems while a 3-inch nail at the hardware store weighs in at a modest 3 grams. There are many other trace elements within the body and this has even been immortalised in the child-hood poem that was reworked by Terry Pratchett in his novel Wintersmith
3.And the Strongest Muscle Is?
Contrary to romantic belief that the heart is and the feminist belief that the womb contains the most powerful human muscles the actual holder of that title is the masseter. If you put your hands on the sides of your face and switch between opening your mouth and biting down, clenching and flexing your jaw muscles, you are activating your masseters. Working the muscle as you feel its action will help you to understand the importance of the masseter as it is the muscle that pulls your lower jaw up, helping you chew through even the toughest food.
2.Big Ears – and Nose!
Your ears and nose never stop growing throughout your lifetime. This is why older people seem to have these features exaggerated and more prominent than younger people. It is not because of other bodily structures falling away (such as teeth falling out) although the visible effects of aging can exacerbate the appearance of noses and ears.
1.Stronger than Steel!
Ounce for ounce, human bone is stronger than steel. Of course, this does not mean that we can fling ourselves about with joyous abandon: in order to literally be as strong a man of steel we would have to weigh four or five times the amount we do now… Carrying that kind of weight would slow us down too much and place too much demand upon our systems, making us into strong, but inefficient and constantly fuel-hungry animals.
审校:晃晃 编辑:Candy 来源:前十网