Children wear masks in North Plainfield, New Jersey, US on Oct 25, 2021.As the United States deals with the emerging Omicron variant, the country's top doctor calls for nationwide action to address youth mental health challenges, along-existing "crisis" worsened by the COVID-19pandemic. US Surgeon General Vivek Murthy on Tuesday issued a public health advisory titled "Protecting Youth Mental Health", to highlight the "urgent need" to mitigate the "unprecedented" impact on the mental heal...