Espionage can be illegal and punishable by law in some circumstances.
Abo Elementary School in Artesia, New Mexico was the first public school in the United States constructed entirely underground.
The United States conducted its first successful nuclear test in 1945.
Ball lightning is a rare and unexplained phenomenon.
Francis Biddle was the U.S. Attorney General in September 1942.
The behaviors modeled by quantum mechanics have been described as counterintuitive.
Along the U.S. Pacific Coast, coinciding positive and negative sea-level anomalies can demonstrate the interconnection between oceanic and atmospheric systems during climatic events such as the El Niño Southern Oscillation (ENSO).
Cryptozoology claims that cryptids may exist somewhere in the wild despite lack of scientific substantiation.
The Pacific 'Blob' marine heatwave coincided with unexpected die-offs of California sea lions, Guadalupe fur seals, common murres, and Cassin's auklets.
The Hawaiian Islands were known as the Sandwich Islands in 1874.
David Hilbert proposed a famous list of 23 unsolved problems in mathematics in 1900, known as Hilbert's problems.
Abo Elementary School was listed on the National Register of Historic Places in 1999.
Cryptozoology is criticized for relying on anecdotal information rather than scientific evidence.
The Pony Express, icon of the American West, operated for only 18 months (1860-1861) before the transcontinental telegraph made it obsolete.
The Pacific 'Blob' coincided with unexpected die-offs of California sea lions, Guadalupe fur seals, common murres, and Cassin's auklets.
Cryptozoologists focus their research on entities mentioned in folklore records and rumors.
Cryptozoology is criticized for relying on anecdotal information rather than physical evidence.
David Hilbert posed 23 unsolved mathematical problems in 1900 that became known as Hilbert's problems.
Under the Non-Proliferation Treaty (NPT), the United States, Russia, the United Kingdom, France, and China are recognized as 'nuclear-weapons states' (NWS).
The American Committee for East–West Accord is the name of two related organizations that existed during separate periods of American history.
A toxic algal bloom stretched along the entire West Coast of the United States during the Pacific 'Blob' period.
A toxic algal bloom stretched along the entire West Coast of the United States during the Pacific 'Blob' period.
The guillotine was still in official use in France when Star Wars was released in 1977; the last execution by guillotine occurred in 1977, abolished in 1981.
NASA's SNAP-10A, launched in 1965, was the only nuclear reactor the United States had previously deployed in space.
Natural experiments exist as a type of experimental study distinct from controlled experiments.
A toxic algal bloom stretched along the entire West Coast of the United States during the Pacific Blob period.
'In Closed Territory' is a memoir written by Edgar Beecher Bronson, published in 1910.
The Pacific Blob coincided with unexpected die-offs of California sea lions, Guadalupe fur seals, common murres, and Cassin's auklets.
Towards the end of the 19th century, scientists discovered phenomena in both the macro and micro worlds that classical physics could not explain.
Central American cultures showed astronomical interest in early history.
