Ok, so that there is a bunch of stuff. There is evidence that President Roosevelt knew there would be an attack on Pearl harbor, but he decided to let it happen so that the US would be in on the war (we were not before the attack).
There's not a straight forward answer, but I hoped this helped!
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Freedom of speech is important because, in order to be able to say your thoughts out loud that other people not might agree with, you could use freedom of speech as an answer in order to be able to speak freely.
The government can limit free speech whenever you say something untrue or highly offensive to the government or other higher-up government forms.
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Robespierre overthrown in France. Maximilien Robespierre, the architect of the French Revolution's Reign of Terror, is overthrown and arrested by the National Convention.
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The standard atomic weight is the average mass of an element in atomic mass units. Though individual atoms always have an integer number of atomic mass units, the atomic mass on the periodic table is stated as a decimal number because it is an average of the various isotopes of an element.