Overnight Health Care: CDC says three feet of distance safe in schools | Surging COVID-19 cases in Europe, Brazil signal warning for US | Biden jabs Trump in first visit to CDC

Welcome to Friday’s Overnight Health Care. Researching puppy behavior sounds like a dream assignment. But there’s a big caveat: “There is nothing that will not be chewed or peed on.”If you have any tips, email me at nweixel@thehill.com and follow me…