A potato's key tool, I have all the power.
I am generally used on the half or full hour.
If my cells were deceased or lost or the such,
My partner would only respond to your touch.
What am I?
Eliminate all the days of the week except for one, and to be forthright about it, this day is NOT the day after Sunday or the day before Wednesday. It can't be that Saturday is tomorrow, nor can it be that Saturday was yesterday. It most certainly couldn't be two days before yesterday, and while we're at it, let's eliminate Thursday.
What day is it?
I usually am white or yellow,
Used as a tool by every fellow,
Primarily, used for cutting and grinding,
If slightly damaged, I am repaired with filling.
When broken, I am either capped or removed.
He can bring you joy, sorrow, or everything in between. None have seen, smelt or felt him, yet many still know what he is. He has many types, but he is really just one thing. What is he ?