Here is a question about this article: In 1957, Braunstein further demonstrated that the rudimentary devices could be used for non-radio communication across a short distance. As noted by Kroemer Braunstein".. had set up a simple optical communications link: Music emerging from a record player was used via suitable electronics to modulate the forward current of a GaAs diode. The emitted light was detected by a PbS diode some distance away. This signal was fed into an audio amplifier, and played back by a loudspeaker. Intercepting the beam stopped the music. We had a great deal of fun playing with this setup." This setup presaged the use of LEDs for optical communication applications.
What is the answer to this question: What final device was needed to hear the signal from the initial GaAs diode?
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So... audio amplifier


Here is a question about this article: Losing the First Sino-Japanese War of 1894–1895 was a watershed. Japan, a country long regarded by the Chinese as little more than an upstart nation of pirates, annihilated the Qing government's modernized Beiyang Fleet, then deemed to be the strongest naval force in Asia. The Japanese victory occurred a mere three decades after the Meiji Restoration set a feudal Japan on course to emulate the Western nations in their economic and technological achievements. Finally, in December 1894, the Qing government took concrete steps to reform military institutions and to re-train selected units in westernized drills, tactics and weaponry. These units were collectively called the New Army. The most successful of these was the Beiyang Army under the overall supervision and control of a former Huai Army commander, General Yuan Shikai, who used his position to build networks of loyal officers and eventually become President of the Republic of China.
What is the answer to this question: What was the new modern army called?
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So... the New Army


Here is a question about this article: In editorials published on 29 and 31 July 1914, Wickham Steed, the Times's Chief Editor, argued that the British Empire should enter World War I. On 8 May 1920, also under the editorship of Steed, The Times in an editorial endorsed the anti-Semitic fabrication The Protocols of the Learned Elders of Zion as a genuine document, and called Jews the world's greatest danger. In the leader entitled "The Jewish Peril, a Disturbing Pamphlet: Call for Inquiry", Steed wrote about The Protocols of the Elders of Zion:
What is the answer to this question: The Chief Editor of The Times in 1914 argued that the British Empire should enter what war?
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So...
World War I