If someone with HIV is diagnosed with one of these opportunistic infections (even if the CD4 count is above 200), he or she is said to have AIDS. AIDS usually takes time to develop from the time a person acquires HIV--usually between 2 to 10 years or more.
It has been thought that the wheel was invented in 8000 B.C but the oldest discovered wheel dates back to 3500 B.c. It was discovered in Mesopotamia (nowadays in Iraq). Below are the timelines of wheels and its usage in different era.
Two primary examples, the vehicle wheel and the potter's wheel, arose about the same time. Article by John H. Lienhard. Wheel Invention All the inventions that have ever been created weren t just something that was already drawn out on a piece of paper for the inventors.