Limits

I am very limited though I wish I could do all I desire.
I tried hard but I can't change the dead battery in the fire alarm (thank goodness the beeping finally stopped!!)

I can't replace the headlight in my car though I have the part to do so. 

I can't be in two (or more) places at one time though I am often demanded to be so. 

I am very much human. 

:)