Electrocardiography: Graphs: Incomplete heart block.An early electrocardiograph showing an incomplete heart block. Original… https://www.rawpixel.com/image/8782557/photo-image-moon-space-heartFree Image from public domain licenseNavy Sailors Work Hand in Hand with Civilian Healthcare Employees. Original public domain image from Flickr https://www.rawpixel.com/image/9648329/photo-image-hand-person-medicineFree Image from public domain licensePreparedness and Policy Coordination Team working with CDC’s New York Quarantine Station to react to an arriving… https://www.rawpixel.com/image/2288548/free-photo-image-worker-emergency-covid-planFree Image from public domain license