 Tear down this wall!  was the challenge issued by United States President Ronald Reagan to Soviet Union leader Mikhail Gorbachev to destroy the Berlin Wall, in a speech at the Brandenburg Gate near the Berlin Wall on June 12, 1987, commemorating the 750th anniversary of Berlin.n the 1963  Ich bin ein Berliner  speech, U.S. President John F. Kennedy stated the support of the United States for democratic West Germany shortly after the Soviet-supported Communist state of East Germany erected the Berlin Wall as a barrier to prevent movement from East to West.
Feedback happens when a microphone picks up sound from speakers and then pipes that same sound back through the speakers and picks it up again. The never-ending loop of ear-pain is frustrating to experience, but fairly easy to fix by adjusting the levels of the speakers and microphone.
MIC is the acronym for âMicrobally Influenced Corrosionâ. It refers to the possibility that microorganisms are involved in the deterioration of metallic (as well as non-metallic) materials. MIC is not a new corrosion mechanism but it integrates the role of microorganisms in corrosion processes. suitable definition of MIC, which has been developed in task group 1, is the following: Microbially Influenced Corrrosion (MIC) refers to the influence of microorganisms on the kinetics of corrosion processes of metals, caused by microorganisms adhering to the interfaces (usually called biofilms).