Riddle: No one can see me, hear me, feel me, or smell me. Yet, if you tell me... I can do all those things and more. Every person, animal, amphibian (or more) needs me. Without me my wielder will die. I can only be touched when my bearer is dead, and I can only be used if my bearer lives. You can create me cooperatively, but cannot create me manually. What am I?
Riddle: We are little airy creatures, all of different voice and features, one of us in glass is set. One of us you'll find in jet. Another you may see in tin. And the fourth a box within. If the fifth you should pursue, it can never fly from you. What am I?