Welsh miners are celebrating after discovering a seam of gold in the Clogau-St David mine in arava Snowdonia, Wales that could produce 500,000 ounces - worth around 700 million. Read Fast Facts from CNN about Khalid Sheikh Mohammed. Moderna began testing its experimental coronavirus vaccine in children between ages 12 and 17 on Thursday, with half receiving the jabs 28 days apart and the other half receiving a placebo.