He knew that the west coast of India had been the site of an ancient impact of unknown age and size.
As patients age, genetic mutations or unknown environmental factors may boost the production of deformed proteins, or old brain cells simply may become less able to dispose of debris.
Three years after her death at age 74, she remains virtually unknown in her homeland.
Now Armstrong has made another leap into the great unknown, having passed away today at the age of 82.
FORBES: Neil Armstrong, First Man To Walk On Moon, Dead At 82
The exact cause of spina bifida is unknown, but experts agree women of childbearing age can reduce the risk of their child getting this disease by getting enough folic acid (at least 400 micrograms) from leafy green vegetables, fruits, beans or supplements and vitamin B12 (2.8 micrograms), found in meat and eggs.
CNN: Study: Major benefits for spina bifida surgery in the womb
The radicalization process is occurring more quickly, more widely, and more anonymously in the Internet age, raising the likelihood of surprise attacks by unknown groups whose members and supporters may be difficult to pinpoint.
It's a far cry from the golden age of exploration, when daring men set sail into the unknown, fearful they might suddenly drop off the edge of the world.
The causes of autism remain unknown, though a variety of risk factors for the disorder have been identified, including advanced parental age and preterm birth.
He was virtually unknown as an artist during his lifetime, but his reputation soared in the years after his suicide at the age of 37 following years of mental illness, and his works now hang in major museums and galleries around the globe.
It is unknown who could be in the market for Urlacher, since his speed and athleticism may not mesh well with advanced age.
WSJ: Chicago Bears, Brian Urlacher: The Urlacher Era Is Over in Chicago
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