The blue line

[Fred Foldvary]

 You're at the bar with your buddies, and Bill
Gates walks in through the door. Obviously the distribution of wealth has
become more unequal. But do you really feel worse off?
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I'd like to know how the annoying blue line at the left gets put into email,

why one would inset it,

and whether one can remove it in replying.

Fred Foldvary