Vulcans are pointy-eared humanoids who have a tendency to follow a Vulcan named Surak's ideals: logic is everything. Surak made these guidelines because Vulcan emotions are very explosive when not reigned. They [Vulcans, not emotions] have a very interesting culture, and they have a little bit of telepathy. A very useful an effective offensive move the Vulcans posesse is that of the "Vulcan Nerve Pinch". First seen on the TOS episode "The Enemy Within", it has the effect of rendering unconscious the person to whom the nerve pinch is administered to. Immediately. Also, Vulcan blood is green, because it is based on copper. Their hearts are gray for the same reason. Also, Vulcans have a little psychic ability, and are able to connect two minds together temporarily with a Mind-Meld.