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A computer-generated graphic provided by NASA shows the positions of objects in Earth orbit that are currently being tracked. Space junk has made such a mess of Earth’s orbit that experts say we may need to think about cleaning it up.  More than 23,000 items have been cataloged that are bigger than a basketball, but only 1,100 are functioning spacecraft. (AP Photo/NASA)

Junk orbiting Earth reaching dangerous proportions

Lockheed’s ‘Space Fence’ surveillance system to track cosmic debris that could endanger the International Space Station, satellites that are fundamental to the economy, military and our way of life

These cross sections show the difference between the normal brain and one damaged by Alzheimer's disease. Scientists have linked a new ;protein to Alzheimer's disease.  (The Associated Press)

Protein linked to Alzheimer’s

Scientists have linked a new protein to Alzheimer’s disease, different from the amyloid and t …

Artist's rendering of the world's largest-ever flying bird

Bird had wingspan up to 24 feet

WASHINGTON – When South Carolina construction workers came across the giant, winged fossil a …