Misc: 1992 - who was found sane in milwaukee after he killed and cut up 15 young kids?

Questions

History : What was the name of Plato's school?

History : What was the name of the B-29 used at Hiroshima to drop the bomb?

History : What was the nationality of the prisoners in the "Black hole of Calcutta"?

History : What was the third country to get the "bomb"?

History : What's the resting place of those buried at sea?