Mahboba Rawi has done her maths. She reckons the $4000 she takes to Afghanistan today will feed, clothe and educate 50 children and their widowed mothers for two months. So she will take to the streets of Kabul, where the war-widowed mothers send children as young as three to work, and try to get the children to go to school. Ms Rawi will go with the children to the mothers, to explain her plan: " 'We will give you money so your child will not have to work - if the child goes to school. When the school principal signs...