Answer:
I drive men mad for love of me. Easily beaten, never free.
Describes universities like Harvard and can be poisonous.
What loses its head in the morning and gets it back at night?
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
They're up near the sky, on something very tall. Sometimes they die, only then do they fall.
What is so fragile that saying its name breaks it?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?