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Sneaky white space


Hi,

I'm working nicely along, when all of a sudden Mathematica tells me that 
essentially it can't NIntegrate[Cos[a], {a, -Pi, Pi}]. After 30 minutes 
of searching, I discover that I have an invisible TextCell[""] attached 
to the expression.

First of all, I don't know what I did to put it there. What DID I do? 
Some inadvertent Ctrl-Key combination?

Second, TextCell[""] is mostly invisible and hard to find. Is there a 
way to make it visible or to find it more easily?

Many thanks in advance,


Sam


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