Depression increases your risk of a number of diseases and other conditions by, for example, increasing levels of stress hormones such as cortisol or adrenaline. Depression can affect the immune system, making it harder for your body to fight infection. Vaccinations are even less effective in people with depression.
The total surface area of the Earth is about 7008510000000000000â 510 million km2 (197 million sq mi). Of this, 70.8%, or 7008361130000000000â 361.13 million km2 (139.43 million sq mi), is below sea level and covered by ocean water.
It is very doubtful if there have ever live as many as 20,000,000,000 people born on the earth. But be very liberal, and count them as 40,000,000,000. Texas is said to have an area of 262,398 square miles which, less the 3,498 square miles of water surface, would leave 258,900 square miles of land surface.