Kindness matters, Duchess of Cambridge tells schoolchildren

The Duchess of Cambridge told a group of children to look for opportunities to be kind as she and her husband Prince William visited a primary school on Monday as part of a campaign to raise awareness of children's mental health issues. William and Catherine attended a "Big Assembly" event at a London school as part of the "Heads Together" campaign that the couple and the prince's younger brother Prince Harry are spearheading to tackle the stigma of mental health in Britain.