our kyung lah is live on the scene. gun violence epidemic, more than 200 mass shoot ings inless than five months. phil mickelson making history as the oldest winner of a tournament. i am pamela brown in washington, around the world, you are live in the cnn newsroom on this sunday. new information raising questions about the origin of the coronavirus, where it came from and who got sick first and is anyone trying to hide the truth? most roads in the covid origin story leads to china where the disease first appeared and people began falling ill. the question is when and a few high level reports of the timeline are not matching up. we have several guests to talk about this. josh rogan is with us, cnn s national security correspondent.