2 is the first prime number, and also the only even prime. 2+2=2x2=2^2 2!=2 There are particles and anti-particles in the universe. And two types of electrical charges. 2 times pi is what you get when you divide a circle's perimeter by its radius. If you add the numbers in the nth line in Pascal's Triangle, you'll get 2^n In a Sierpinski's Triangle, the height of the outside triangle is twice as much as the inside triangle. 2 points define a line. 2 kinda looks like a swan. 2 is amazing.