Policy makers and amateur psychology pundits think "necessity is the mother of invention" - and sometimes it is, that is why that became a saying, but plain old opportunity matters a lot. Natural gas had been around for 70 years, for example, and the United States has plenty of coal, but hydraulic fracturing, a modern form of extraction, has made natural gas cheaper and led to reduced greenhouse gas emissions, a competitive advantage and a 'win' for the environment - it was developed due to opportunity, not necessity.

As baby boomers, originally the children born in 1946, after soldiers returned home from World War II in 1945 but later extended out to be an entire generation, move into old age, the financial burden of Alzheimer's disease in the United States will skyrocket to $1.5 trillion from current  from $307 billion
estimates, according to health policy scholars at the USC Leonard D. Schaeffer Center for Health Policy and Economics.

According to the U.S. Census Bureau, in 2012, 43.1 million Americans were 65 and older, constituting 14 percent of the population. By 2050, that number will more than double to 83.7 million, constituting 21 percent of the population.

Acute rejection after kidney transplantation occurs in about 15% of patients despite immunosuppressive therapy and this rejection is usually heralded by an increase in the patient's serum creatinine, a marker of kidney function. A kidney biopsy is then performed to confirm whether rejection is taking place.

Yet elevated creatinine is not sufficiently sensitive to identify all early rejection or specific enough to prevent some unnecessary kidney biopsies, so a noninvasive means of identifying acute rejection is needed.

A new active asteroid called 62412 has been located in the Solar System's main asteroid belt between Mars and Jupiter. It is the first comet-like object seen in the Hygiea family of asteroids.  

A team of researchers have developed a gene regulation method that enables thought-specific brainwaves to control the conversion of genes into proteins - gene expression.

If you're a native of rural Mozambique who contracts a disease and becomes symptomatic, you'll likely consult a traditional healer before getting medical advice.