Answer:
Describes universities like Harvard and can be poisonous.
I wear a red robe, with staff in hand, and a stone in my throat.
Vikings use this for warmth.
If you happen to wear one of these warm garments around, you might get doused in red paint.
In the land of the green glass door there are riddles but no answers, sheets but no blankets, and books but no words. Name something found in the land of the green glass door.
You use it between your head and your toes, the more it works the thinner it grows.