Signing Savvy, Your Sign Language Resource

I was under the impression that American Sign Language signs varied only slightly, until i visited aslpro.com. Whole new variation of signs.

I've seen "why" signed similarly, but instead of a "y" hand coming from the head it was the middle finger shaking back and forth with the other fingers extended. I saw that on a Signing Time episode.

I've seen seen it that way too, Maya. I've also seen why signed the same way this site shows it, only instead of the "y" hand coming down from the forehead it was going down from about an inch away from the forehead...

Amazing how there's so many signs for the same word.

I was wondering if someone could explain to me the difference between the signs for "why" and "because". They look very similar.