Answer:
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure, a matter of course. What am I?
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
I belong to you but others use me more often than you do. What am I?
You use a knife to slice my head but you weep beside me when I am dead
I am owned by the poor the rich does not need me. If you eat me you will die!
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?