Answer:
Though I wander the earth, I am no longer here. I am pale and I chill everyone near. Who am I?
What is the heart of many risks, has a heart, but is not a living being?
What grows in winter, dies in summer, and grows roots upward?
What is it that you must give before you can keep it.
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.