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Due to recording mastering and manufacturing limitations, both high and low frequencies were removed from the first recorded signals by various formulae. With low frequencies, the stylus must swing a long way from side to side, requiring the groove to be wide, taking up more space and limiting the playing time of the record. At high frequencies, hiss, pops, and ticks are significant. These problems can be reduced by using equalization to an agreed standard. During recording the amplitude of low frequencies is reduced, thus reducing the groove width required, and the amplitude at high frequencies is increased. The playback equipment boosts bass and cuts treble so as to restore the tonal balance in the original signal; this also reduces the high frequency noise. Thus more music will fit on the record, and noise is reduced.
What kinds of unwanted sounds are often heard at high frequencies?
A: hiss, pops, and ticks

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In October 1961, Nasser embarked on a major nationalization program for Egypt, believing the total adoption of socialism was the answer to his country's problems and would have prevented Syria's secession. In order to organize and solidify his popular base with Egypt's citizens and counter the army's influence, Nasser introduced the National Charter in 1962 and a new constitution. The charter called for universal health care, affordable housing, vocational schools, greater women's rights and a family planning program, as well as widening the Suez Canal.
What year was the National Charter released?
A: 1962

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The anti-bullying It Gets Better Project expanded from a single YouTube video directed to discouraged or suicidal LGBT teens, that within two months drew video responses from hundreds including U.S. President Barack Obama, Vice President Biden, White House staff, and several cabinet secretaries. Similarly, in response to fifteen-year-old Amanda Todd's video "My story: Struggling, bullying, suicide, self-harm", legislative action was undertaken almost immediately after her suicide to study the prevalence of bullying and form a national anti-bullying strategy.
Whose video prompted legislative action within two months?
A: unanswerable

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The vast majority of devices containing LEDs are "safe under all conditions of normal use", and so are classified as "Class 1 LED product"/"LED Klasse 1". At present, only a few LEDsextremely bright LEDs that also have a tightly focused viewing angle of 8 or lesscould, in theory, cause temporary blindness, and so are classified as "Class 2". The opinion of the French Agency for Food, Environmental and Occupational Health & Safety (ANSES) of 2010, on the health issues concerning LEDs, suggested banning public use of lamps which were in the moderate Risk Group 2, especially those with a high blue component in places frequented by children. In general, laser safety regulationsand the "Class 1", "Class 2", etc. systemalso apply to LEDs.
What does being a Class 2 LED product mean?
A:
unanswerable