Animals went into the Ark two by two. That's cool.
Two can be as bad as one, but the loneliest number is the number one.
Me and you is two, and that's cool.
Me and my Dog is two, and that's cool also, if I had a dog.
Two is a prime number, the first prime, which is cool.
Two plus two equals two to the second power. It's the only time that happens. That's cool.
Mars has two moons, which is pretty cool.
We have two eyes, two ears, two arms, two legs. Fortunately, we only have one tongue. That's cool.
In English we have three homonyms that sound like the number two: to, too and two. That's cool.
Two is just too cool.