Although when Christianity appeared the total population of the planet was only a fraction of that of the twentieth century, most of the earth's surface was quite outside the Mediterranean world, Persia, India, and China. ↗
I know too that we Americans like to think of ourselves as cleaner than clean, a healthy nation who would never take anything when a recent poll suggested that 65 per cent of the population would risk dying in 10 years if they would be guaranteed Olympic gold. ↗
Many Americans are unaware that we still have a large population of working families, elderly, and children who rely on emergency food pantries, shelters, and other resources to meet their nutritional needs. ↗
The constant effort towards population, which is found even in the most vicious societies, increases the number of people before the means of subsistence are increased. ↗
Five years from now, 10 years from now, there's going to be a huge Islamic population in the world, they're going to be nationalistic, they're going to be religious, and they're going to be militant. ↗
The great increase of our population throughout the Union will alone produce an important effect, and in no quarter will it be so sensibly felt as in those in contemplation. ↗
Another interesting field, which is my own, is cofactors, not only to the disease but also to transmission. I am still puzzled by the fact that you get more sexual transmission in some ethnic populations. One way to answer this is to look for genetic factors. ↗