Answer:
I can wave my hands at you but I never say goodbye. You are always cool when with me even more so when I am high!
Born of sorrow, grows with age, you need a lot to be a sage. What is it?
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
Send poorly behaved children to me and let them sit here. What am I?
I am a king who's good at measuring stuff.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.