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Principle of complementarity
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Supercluster
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OFDM
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Orphan disease
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Electromyogram
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Geyser
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ICANN
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Cardiac myocyte
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Anaphylactic shock
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Microglia
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AJAX
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Final energy
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Richter Scale
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Artificial selection
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Time
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Black walnut
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Tongue
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Electrocution
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Wettability
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Retinoid
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Ecological footprint
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Nix
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Inherited
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Pregnancy
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Mersenne prime
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CT arthrogram
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SAFER
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MBMS
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Cation
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Diffuse
Hydra
Hydra is the familiar name of Pluto's moon S/2005 P 2 discovered in May 2005 by the Hubble space telescope. It is named after the Hydra of Greek mythology, a nine-headed creature slain by Hercules.
The Pluto system with its three moons, Charon, the closest, Nix and Hydra, the furthest.
(Credits: NASA / STScI)
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