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A small population of asteroids pass by both the Earth and Mars in their orbits. So the idea is that a spacecraft containing Mars-bound astronauts could rendezvous with one of these objects as it goes by the Earth and travel with it until it nears the Red Planet.
In one version of the idea, the astronauts would actually dig a hole in the asteroid, put the spacecraft inside and cover it over with material from the asteroid. Within this protective burrow, the spacecraft would be shielded from cosmic rays during the six- to 10- month journey to Mars.
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Some people experience a number of acute picornavirus infections in their lives. This fact may explain the severe memory problems seen in some elderly people who do not have neurodegenerative illnesses, such as Alzheimer’s disease, the researchers suggest.
Charles Howe at the Mayo Clinic College of Medicine in Rochester, Minnesota, US, and colleagues injected mice with Theiler’s murine encephalomyelitis virus, which is related to human poliovirus. Because of their genetic makeup, the strain of mice used in the experiment got sick but did not develop paralysis from the infection.