Anonymous saying, dating back at least to its citation in Natural Theology (1836) by Thomas Chalmers, Bk. II, Ch. III : On the Strength of the Evidences for a God in the Phenomena of Visible and External Nature, § 15, where the author states: "It has been said that there is nothing more uncommon than common sense."; it has since become misattributed to particular people, including Frank Lloyd Wright
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Nothing, because they cannot. You need at least a pair of data for two variables before correlation can be calculated. That means at least four numbers.
Two lines with one point in common are said to intersect at that point. Any two straight lines with infinite length will eventually intersect each other, unless they are parallel to each other.
Lines that have one point in common are said to intersect one another at that point. Almost all straight lines of infinite length intersect one another, unless they are parallel to each other.
Joint sets:Joint sets are those which have common elements Disjoint sets : A pair of sets is said to be disjoint if their intersection is the empty set. That is to say, if they share no elements. All of the usual operations can be performed on disjoint sets, so long as the operation makes sense. (For example, taking the complement of one with respect to the other could pose problems.)