Neutrophils are the most common type of white blood cell, comprising about 50-70% of all white blood cells. They are phagocytic, meaning that they can ingest other cells, though they do not survive the act. Neutrophils are the first immune cells to arrive at a site of infection, through a process known as chemotaxis.
One of the basic theories stipulates that increasing interest rates raise consumers' and manufacturers' costs, which, in turn, reduces the amount of time and money people spend driving. Less people on the road translates to less demand for oil, which can cause oil prices to drop.
Lately, though, the vagaries of gasoline -- driven by the ups and down of crude oil -- have been even more important than usual. Ever since energy prices peaked in the summer of 2014 before collapsing nearly 80 percent into last Februaryâs lows, the health of the stock market, the economy, the U.S. dollar, corporate earnings and the prospect of Federal Reserve rate hikes have all depended on where oil is headed.