Answer:
I have two hands but cannot clap
Walk on the living, they donβt even mumble. Walk on the dead, they mutter and grumble
I fly, yet I have no wings. I cry, yet I have no eyes. Darkness follows me. Lower light I never see.
Left to right Iβm quite bright. Right to left I might bite.
What can be measured but not seen?
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?