No offense to Lolligolli and not meaning to single anyone out, but "George Bush Hit's New All Time Low ..." touches an increasingly frayed nerve. I'm not bothered by the meat of the argument, which is fine, but rather the crux of the biscuit: the apostrophe.
Writing to persuade requires winning the trust of your reader. Errors of punctuation and grammar not only confuse your message, they imply a lack of care in thought.
I'm an editor by trade, and I'd like to offer Kos writers a brief refresher on this punctuation mark, which is not anywhere near as flexible as it often appears.
There are only three legitimate uses for the apostrophe.
1. To indicate possessive use of a noun:
Bush's Brain
But it is never used in possessive pronouns:
its brain
his brain
ours, hers, theirs, ...
The possessive apostrophe follows a natural s at the end of the noun:
The boys' mothers
James' house
The Simpsons' house
2. To mark omitted letters in contractions:
It's nine o'clock.
Gratuitous but necessary emphasis:
"Its" is possessive, "it's" is the contraction of "it is." Completely different usage.
The Summer of '42
The apostrophe stands in for the missing "19". Putting it last, as in 42', is not uncommon, but wrong.
3. To form plurals of single letters and abbreviations:
Dot your i's and cross your t's.
This usage is the source of a lot of confusion. Readers see it and often expand it to plurals in general. It's something we use in speech that doesn't translate well to the page, and in my opinion it's usually better to write around it.
That's it, there are no other uses. I hope this is helpful. For more on punctuation, take a look in the back of your desk dictionary, where you may find all sorts of interesting stuff.