Five years, for any child, feels like a lifetime. For the millions of Syrian children whose lives have been turned upside down by the conflict, these last five years must have felt even longer than that. The conflict in Syria has now raged for half a decade, and in this time the millions of children affected have had to deal with more suffering and heartbreak than most of us will ever experience. The conflict has placed millions of children in terrible danger, and sadly a real end to the turmoil still seems a distant prospect. More than eight million Syrian children are now in urgent need of humanitarian aid in what is the greatest humanitarian crisis since World War II.