Each year tens of thousands of children, some as young as 10, are married in a handful of American states, including California, which have no lower age limit for marriage. Most of these weddings involve a young girl marrying a man who is over 18. Will a new campaign bring the practice to an end?...

In Britain and beyond, health services are desperately seeking blood donors. But could science help ease the crisis? This week scientists have taken a step closer to being able to convert blood from one type to another, which would allow donations to be used more efficiently and effectively. Plus...