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.
of 07. The History of Theme Park Inventions - The Ferris Wheel. The first ferris wheel was designed by George W. Ferris, a bridge-builder from Pittsburgh, Pennsylvania. Ferris began his career in the railroad industry and then pursued an interest in bridge building. He understood the growing need for structural steel, Ferris founded G.W.G.