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?
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
My days are numbered.
I have keys but no locks. I have space but no room. You can enter but canβt go outside. What am I?
What is always coming but never arrives?