It was first observed in 1846
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AnswerCrossword Clue
NEPTUNEIt was first observed in 1846
SITUIn .. (where it first was)
EVERESTIt was first conquered in 1953
MTMCKINLEYIt was first climbed in 1913
HYDROGENBOMBIt was first tested in 1952
MATTERHORNIt was first conquered in 1865
NEWTIt was a first name in Congress
EROICAIt was first publicly performed in Vienna in 1805
OTHELLOIt was first performed at Whitehall Palace in 1604
AMERICAIt was first sung in Boston, July 4, 1832.
COLUMBUSDAYColorado, in 1905, was the first state to observe it
WNBALisa Leslie was the first to dunk in it: Abbr.
NLCSIt was first won by the N.Y. Mets in 1969
NICKELIt was redesigned in 2004 for the first time in 66 years
COLBYCheese named for the Wisconsin city in which it was first produced
ICEFor the first time in millions of years, it was absent from the North Pole
mendeleviumThe chemical element of atomic number 101, a radioactive metal of the actinide series. It does not occur naturally and was first made in 1955 by bombarding einsteinium with helium ions
promethiumThe chemical element of atomic number 61, a radioactive metal of the lanthanide series. It was first produced artificially in a nuclear reactor and occurs in nature in traces as a product of uranium fission