1898 ⟶ J.J. O'Donnell Documents Tornado Sound Sequence
J. J. O'Donnell discovers and documents the order-of-sequenc...
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🗺️ Lewis and Clark Expedition Begins Exploration of Western North America
Lewis and Clark Expedition in western U.S.⟶
ExplorationUnited States HistoryMappingIndigenous PeoplesTerritorial Expansion
United States🌪️ J.J. O'Donnell Documents Tornado Sound Sequence
J. J. O'Donnell discovers and documents the order-of-sequence for the sound of an approaching tornado⟶
MeteorologyNatural DisasterWeatherObservationUnited States History
United States🔬 Millikan Determines the Charge of an Electron
Robert Andrews Millikan: conducts the oil drop experiment and determines the charge on an electron⟶
PhysicsAtomic TheoryExperimental PhysicsScientific MethodModern PhysicsQuantum Mechanics
United States🕊️ Martha, the Last Passenger Pigeon, Dies
September 1: Martha, last known passenger pigeon, dies.⟶
ExtinctionEnvironmentalismConservationWildlifeZoology
United States📡 Karl Jansky Detects Radio Waves from the Milky Way Center
Karl Guthe Jansky discovers the first astronomical radio source, Sagittarius A⟶
AstronomyRadio AstronomyAstrophysicsCosmologyMilky Way
United States🔬 Calorie Restriction Experiments Extend Lifespan of Rats
Clive McCay: Calorie restriction extends the maximum lifespan of another species⟶
BiologyAgingLongevity20th Century Science
United States