Answer:
Which word contains all 26 letters?
Once you know it exists, it no longer exists. What is it?
I run cold and hot, I look blue but am red. What am I?
What is it that you must give before you can keep it
I reach for the sky, but clutch to the ground. Sometimes I leave, but I am always around
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.