[Sca-cooks] 5th Taste?

[kingstaste at mindspring.com]

I recall hearing recently that researchers had identified a 5th separate
taste - and I believe it was acrid.  (This in addition to sweet - tip of the
tongue, salty - middle tongue, sour - sides of the tongue, and bitter - back
of the tongue).
Does anyone else remember this?  When I brought this up in training, I was
then asked for examples of acrid tastes, and couldn't come up with any.
What say all of you?
Christianna
(Mad Scientist in Training - this is for a class about Taste)