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Surprisingly few in fact. The main differences were in the development of weapons from WW1 during WW2. The Tank, Submarine and Airplane all debuted during WW1 but were greatly improved in WW2. Small arms and artillery remained essentially unchanged. The main WW2 inovations were the Atomic Bomb, Guided and Unguided Missiles and Jet Airplanes. All three were still crude during WW2 and were only fully developed during the Cold War.
Jets were introduced by the Nazi's towards the end of WWII. Helicopters debuted for the Americans in Korea. Admitting that the question itself is requesting a subjective answer, I'm tempted to say the first war to see extensive use of both jets and helicopters was Viet Nam, but that was only a conflict, so I guess the first American war to see extensive use of both jets and helicopters was Gulf War I, and the first war in the world to see extensive use of both jets and helicopters was probably the Falklands War.
The broadcast of NHL games debuted on TSN in 2002. The coverage includes national broadcast of NHL games several nights per week and select games during the playoffs.
The Today Show is a popular American morning television broadcast on NBC and debuted in January of 1952. It was originally a two hour program, but was increased to four hours in 2007.
The exact date Child's Play debuted on TV has apparently been lost to broadcast history, however it is certainly safe to assume it debuted on TV, most likely on a cable movie channel around the time it was released on VHS in 1989.
It debuted in 1966, being shown on 27 October 1966 on CBS TV.
It depends on what you would consider a "TV Show" , the play The Queen's Messenger broadcast in September 1928.There were a few 'first' regular TV shows that debuted in 1931 called Television Today, Piano Lessons, Hints for Swimmers & The Television Ghost.
they debuted in 2008 with Replay(Nuna nomu yeppo).
The longest running show in history in 1988 as well as the present day is Meet the Press. If you mean what is the longest running show that simply debuted in 1988 & continues today, well, there aren't any American shows that debuted in 1988 that continue to this day [as of this answer in July 2017].In Australia the second incarnation of the news show A Current Affair started in 1988 and still airs, as well as the sports broadcast Friday Night Football & the soap opera Home & Away.The British program Countryfile, that features reports on British rural, agriculture & environmental issues debuted in '88. Fifteen to One debuted as well & continues to air today although it did not have a continuous run since '88. The sports program Sgorio & the morning show This Morning debuted in '88.The German news show RTL aktuell & the Italian news parody program Striscia la notizia debuted in 1988.
debuted in 1959
Music and the Spoken Word the oldest continuous nationwide broadcast in the world, which began July 15, 1929 & continues today.
1999
The 1920s were a great decade for entertainment firsts. Some of the most important were: Commercial radio made its debut in Pittsburgh (KDKA), Detroit (8MK) and Greater Boston (1XE, Medford Hillside) in 1920. The first broadcast of a world's series baseball game occurred in 1921. The first national radio network, the National Broadcasting Company (NBC) debuted in 1926. And the first successful talking picture, a movie called "The Jazz Singer," debuted in 1927.
Blackpink debuted in 2016