https://www.ldoceonline.com/dictionary/may-just-might-just "Just" here is part of an idiom that conveys possibility and does not mean "simply" or have any meaning that suggests the problem is small. "Might just" and "might simply" do not mean the same thing in English.
Paraneoptera
This map is apparently from Wikipedia, and is based on a 1995 CIA ethnolinguistic map. The version here is identified as from 2007, with some changes made by wikipedia commons editors (visible changes in Abkhazia and other places). The changes are marked as disputed and unsourced, and it does seem like someone took the letters marking general presence of an ethnolinguistic group (indicating sporadic presence) from the 1995 map and converted those letters into solid bands. This does seem to be a dubious change, as I cannot find any support for this solid separation of groups in Abkhazia and elsewhere.
American customary units and imperial units both come from English units, so the US used various inconsistent English and other units in its early days. But the US never used "Imperial" units, which were not codified and put into effect in the British Empire until almost 50 years after the US had gained independence.
Great grandfather's sister's grandson is your second cousin once removed. That guy is the second cousin of one of your parents because they share great grandparents with one of your parents. A grandparent's sibling is a great aunt or great uncle to you. A great grandparent's sibling is a great great uncle or great great aunt to you.
Not in classical Sanskrit. Vedic Sanskrit had pitch accent, which had been lost by the classical Sanskrit era. English has stress accent. But many languages do not have stress accent, and either have pitch accent or syllables are not accented at all.
This idiom works differently than you think. This thread https://old.reddit.com/r/EnglishLearning/comments/161uisc/what_does_it_mean_you_just_might/ Captures the basic meaning of the idiom "Just" in isolation can mean something different than when it's added to a phrase. Don't take my word for it though, Google "might just idiom" for more discussion. This is the thing about idioms, phrasal verbs and the like: they take words that have different meaning in isolation and by joining them alter the meanings of the individual words.