Answer:
Only two backbones and thousands of ribs.
Describes universities like Harvard and can be poisonous.
At night I come without being fetched. By day I am lost without being stolen.
What flies around all day but never goes anywhere?
Two brothers we are, great burdens we bear. All day we are bitterly pressed. Yet this I will say, we are full all the day, and empty when go to rest.
Iām grown from darkness but shine with a pale light. Very round I am and always a lady's delight.