It's "fewer" when talking about quantities of distinct units, such as people, bricks of Soylent Green, and wizards who turn you into a whale, and it's "less" when talking about more indistinct amounts, such as water, time, and hatred. Rule of thumb: if it's plural, use "fewer"; if it's singular, use "less." I hope T-Rex and I have both taught you a lessen. ~_^...and the punster, as well, it appears.
"such as water, time, and hatred."Woot! One further step in my plans for world domination!!!
This is todays best collection of words on the internets.