April 25
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1953 – Francis Crick and James Watson publish "Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid" describing the double helix structure of DNA.
1983 – Pioneer 10 travels beyond Pluto's orbit.
2410 – Captain Paul Braggins is named as commanding officer of the USS Ticonderoga, CA-1471.