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.
The potter's wheel was invented about 7000 years ago and has become the method of choice for many potters. In all methods it is essential for the clay to contain some water; not too much, because that makes the clay too soft and unworkable, or even turns it into 'slip' - a dispersion of clay in water.