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  2. 1970 Marcos State of the Nation Address protest - Wikipedia

    en.wikipedia.org/wiki/1970_Marcos_State_of_the...

    The protest during Ferdinand Marcos' Fifth State of the Nation Address on January 26, 1970, and its violent dispersal by police units, [1] marked a key turning point in the administration of Ferdinand Marcos, and the beginning of what would later be called the "First Quarter Storm" a period of civil unrest in the Philippines which took place during the first quarter of the year 1970.

  3. Stanhope Demonstrator - Wikipedia

    en.wikipedia.org/wiki/Stanhope_Demonstrator

    The Stanhope Demonstrator was the first machine to solve problems in logic. [1] It was designed by Charles Stanhope, 3rd Earl Stanhope to demonstrate consequences in logic symbolically. The first model was constructed in 1775.

  4. Demonstration (teaching) - Wikipedia

    en.wikipedia.org/wiki/Demonstration_(teaching)

    Demonstrations often occur when students have a hard time connecting theories to actual practice or when students are unable to understand application of theories. [ citation needed ] Teachers not only demonstrate specific learning concepts within the classroom, they can also participate in demonstration classrooms to help improve their own ...

  5. GE U25B - Wikipedia

    en.wikipedia.org/wiki/GE_U25B

    General Electric (demonstrator) 4: 753–756: High short hood; to Frisco 804–807 4: 2501–2504: to Union Pacific 633–636 4: 51-54: to Frisco 812, 814, 815, and 813. Atchison, Topeka and Santa Fe Railway: 16: 1600–1615: renumbered 6600–6615 Chesapeake and Ohio Railway: 38: 2500–2537: renumbered 8100–8137 Chicago, Burlington and ...

  6. Nashville sit-ins - Wikipedia

    en.wikipedia.org/wiki/Nashville_sit-ins

    Over the course of the Nashville sit-in campaign, sit-ins were staged at numerous stores in the central business district. Over 150 students were eventually arrested for refusing to vacate store lunch counters when ordered to do so by police. At trial, the students were represented by a group of 13 lawyers, headed by Z. Alexander Looby.

  7. Space Shuttle Challenger disaster - Wikipedia

    en.wikipedia.org/wiki/Space_Shuttle_Challenger...

    [3]: 122–123 [8] A 1977 test showed that up to 0.052 inches (1.3 mm) of joint rotation occurred during the simulated internal pressure of a launch. Joint rotation, which occurred when the tang and clevis bent away from each other, reduced the pressure on the O-rings, which weakened their seals and made it possible for combustion gases to ...