As early as this weekend, some 90 trucks will roll off a metal causeway onto a beach in Gaza. Then the United Nations will deliver the much-needed food and medicine to Palestinians, some of whom are already suffering famine conditions. The United Nations said half of Gaza's more than 2 million people are starving. But questions remain about whether this will be a successful operation. Senior military officials say tens of thousands of desperate residents could cluster at the end of the...