Crossword puzzle clue "scientific discovery of 1868"

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Answer
Clue
Relevancy
helium
Clue
Scientific discovery of 1868
Definition
a gaseous element
argon
Clue
Scientific discovery of 1894
Definition
an inert gaseous element
dna
Clue
Scientific discovery of 1869
firstforknowledge
Clue
Brand-new scientific discovery?
higgsboson
Clue
Scientific discovery nominated for Time's 2012 person of the year
neon
Clue
Scientific discovery of 1898
Definition
a gaseous element
airbrake
Clue
Invention of 1868
Westinghouse's invention: 1868

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