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Summary:
Razor blade, a thin, sharp piece of metal often coupling with a firm device, is widely used as a shaving material, and else applications such as cutting and scraping that are utilized by tailor, wall paper hanger, barber, and painters.
2.
Autograph collect:
à business | Thousands of people are crazy about it . This collection hobby wave also produces companies that earn thousands of dollars. |
àPrice? | Not depend on fame but the rarity. Death doesn’t affect the price. |
Autograph collect has become a wave that thousands of people are crazy about it, and gradually becomes a business that companies earn thousands of dollars a year. The price of one signature doesn’t depend on the fame but rarity, and death or not either no matter. Price of one signature can up to $750,000, a letter written by Abraham Lincoln.
3.
Women live longer than men
American male: 69.7
American female: 77.3
Reason: unknown
Chromosome:
1. Scientist: sex chromosomes account for the differences in mortality
àTwo X chromosomes compensate the defects of each other.
àOne X and a lighter Y chromosome may responsible for the life expectancy.
Life style/ habits
2. Doctors: differences in life style and personal habits that causes heart disease, like poorer diets, less exercise, smoking
Hormones
3. New studies:
Female sex hormones, estrogen and progesterone protect them from heart disease.
Present research:
è Death rate declines that both genders are aware of life style affecting health.
è Life style changing in both genders benefits the present research on natural factor.
The fact that women live longer than men, has not been clarified from scientists. From statistics, life expectancy of American male is around 69, while 8 years longer for American female on average. Basically, some scientists believe the differences of chromosome between two genders play an important role: Two X chromosomes possessed by women compensate the defects of each other; for men, lake of the coupling chromosome but taken place by a lighter chromosome Y. Some doctors suggest the life style and habits like poorer diet, less exercise, or smoking that have dominantly occurred on male may cause the heart disease. In recent research, some propose female sex hormones like estrogen and progesterone protect women from disease. Now that death rate from heart disease had being declines since both genders are aware of health life, the present research can be focus on the natural factors such as chromosomes, hormones without interacting with other habits matters.
