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Space and astronomy
Astrophysics
astronomy
Solar System
space missions
man in space
environment and energy
Environmental sciences - the climate crisis
Earth science
environmental issues
energy
transportation
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exact sciences
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nano-tech
military technology
futurology
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medicine
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the brain
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history
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Israel in space
the defense industries
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This is how a medieval alchemist described eternal life. Free image from wikimedia commons
http://commons.wikimedia.org/wiki/File:Ouroboros.png
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