Bacteria.

"Researchers from the Wright Patterson Medical Center in Dayton, Ohio, asked people standing in line at a grocery store checkout and at a high school concession stand to trade a $1 bill from their pocket for a new one. Then the doctors analyzed 68 of those old, worn bills.

Five of the bills contained bacteria that can cause an infection in perfectly healthy people, and 59 of them (that’s 87 percent) were contaminated with bacteria that could cause an infection in anyone with a compromised immune system, such as people with HIV or cancer.

Only four of the bills were relatively clean."

"How would you spend a million if you had one?"
"Oh... Could you may be give me a thousad or two a month instead? I think, if I suddenly  got a million I would immediately start to think to whom should I give it and got nervous and.... so a little bit but each month would be much better I believe!"

(c) my friend L.

Honestly, I believe that the comfortable life is so relevant to the amount people have. Additionally, The knowledge of the benefits that money can achieve is most important. This knowledge, and experience support people to increase their money, otherwise, people may spend all of their money for life expenses and one day they will not have money any more for future circumstances. sophisticated and experienced wealthy people can keep their money in certain business and use the achieved profits for life expenses, just a practical approach in business life.