It has been more than two weeks since Hamas, the armed Palestinian group that controls Gaza, launched a terrorist attack that killed 1,400 Israelis. Since then, the Hamas-run health ministry has said that more than 5,000 people have died in retaliatory strikes by Israel. It has not been possible to independently verify the death toll in Gaza.Here is what we know about some of the most pressing issues raised by the war and the complex negotiations taking place to resolve them, including efforts to get more aid into Gaza, bring trapped foreigners out, free hostages taken in the surprise attack…