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!
I build up castles. I tear down mountains. I make some men blind, but I help others to see. What am I?
I am commonly abbreviated to H
I can be long or short. I can be grown or bought. I can be painted or left bare. My tip can be round or square. (one word)
Although glory but not at my best. Power will fall to me when the man who made me dies.
The answer I give is yes, but what I mean is no. What was the question?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic