http://www.culturediversity.org/what is race.htm

http://www.aaanet.org/stmts/racepp.htm

There is also plenty of stuff out there to counter these arguments. So have a hunt and post that to.

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"Religion is excellent stuff for keeping common people quiet."
--Napoleon

Race is a biological concept. The classifications - not so much.
Classification systems aren't natural properties of the world, but human inventions, which are defined by human beings, for the purpose of making information easier for other humans to access and pass on.

Race is not hard to define, although definitions may change so as to not quite match what you see; in this case a wise man must accept the new scientific classifications. It doesn't take away the old guidelines. For example, people used to think dolphins were fish, and some people are still irate that we can't treat them as such, now that more advanced methods of classifying animals have put them in technically the same group as we people.

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"One of the Germans... would frequently snatch a child from the
woman's arms and... tear the child in half... Such incidents...
occurred all the time." - A Year in Treblinka, Yankel Wiernik,
Treblinka's "most authoritative eyewitness"

However if race was not hard to define I doubt you see the amount of debate we see in the scientific community.

When you speak of somebody's race what do you mean exactly?

And how many race's are there exactly?

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"Religion is excellent stuff for keeping common people quiet."
--Napoleon

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When you speak of somebody's race what do you mean exactly?

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And how many race's are there exactly?

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As I said - the classifications are a human invention.

But, I usually see 5 - Caucasoid, Congoid, Capoid, Mongoloid, and Australoid.

-------
"One of the Germans... would frequently snatch a child from the
woman's arms and... tear the child in half... Such incidents...
occurred all the time." - A Year in Treblinka, Yankel Wiernik,
Treblinka's "most authoritative eyewitness"