Halo 3 Terminals and IWBYD Skull

I need help with finding all the terminals and the IWBYD skull. If you know where all the terminals are and how to get the IWBYD Skull. Message TheUnforgivenV if you’re up for it.

I know.

Try YouTube!

http://www.youtube.com/watch?v=kTTGOWqkTWo- IWBYD
http://www.youtube.com/watch?v=JdHm-VJnWAU- Terminals

Seriously, who thought of the IWBYD placement idea…
Do you know about the secret Cortana skull and terminal?