Coffee

[KurtV]

Two things happen when coffee sits just after it's brewed (on a plate that isn't hot enough to boil it off)
1) the convection currents even it out. you can (should) stir it if you don't have time.
2) there's a slight smoothing of the flavor as some oils evaporate.
...

You lost me there Carl. External heating after brewing always makes coffee worse and it only takes a few minutes to degrade the taste noticeably. That's the reason you'll never see coffee on a warmer in a decent coffee house; they transfer it immediately to an airpot.