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This is a very subtle (and hard to remember) difference, but the heading for an answer is bolded and slightly lighter [in colour] than the heading for a question

###Question

###Answer

For easier comparison, I've placed them side by side below:

^{(question)
(answer)}

The same difference is also in your Review History tab.

Note the differences between the Google appengine Q/As. The answer heading is also slightly smaller, which doesn't seem to occur on the normal Edit Review screen.