Answer:
Look into my face and I'm everybody. Scratch my back and I'm nobody.
A tiny bead, like fragile glass, strung along a cord of grass.
What type of bar gets you wet walking in and out of it but keeps you dry inside?
What is it that given one, youβll have either two or none?
The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?