Answer:
The more of this there is the less you see. What is it?
I help you carry your books.
I'm where yesterday follows today and tomorrow is in the middle. What am I?
The higher I climb, the hotter I engage. I cannot escape my crystal cage. What am I?
I have fangs and enjoy piecing holes with a single bite.
I fly to any foreign parts assisted by my spreading wings. My body holds an hundred hearts Nay I will tell you stranger things when I am not in haste I ride and then I mend my pace anon.