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The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.

What Is the Emoluments Clause?

Calendar marking march 15th

22 Questions About Time and Timekeeping Answered

After a perfect launch, spectators try to catch a last glimpse of Space Shuttle Columbia, barely visible at the top end of the twisted column of smoke.

7 Accidents and Disasters in Spaceflight History

Space race (1957-1969) infographic between United States (U.S.) and Russia. America, Soviet Union, U.S.S.R., space exploration

Timeline of the Space Race, 1957–69

Calendar showing the month of February

Why Are There Only 28 Days in February?

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

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logical relation transitive law commutative law equivalence relation distributive law associative law ordering symmetry reflexivity binary relation formal system theorem argument history of logic formal logic applied logic metalogic philosophy of logic fuzzy logic predicate calculus