No? read this :p

Now you do know, dont you? XD

If you still have no idea, then..

err..

It's when someone have an extra chromosome, which causes a chromosomal condition which affects the shape of their face. People who are subjected to this chromosomal condition will have similar physical characteristics. (like similar faces. you ever heard about a case when many people of different ages have similar faces even though they aren't blood related?)

okay, enough with the info.

now see this.