How can you avoid getting sick on a plane? The U.S. Olympic team’s top doctor has advice on where to sit, what to wipe down and what to do with the air nozzle to prevent illness. 🔗 https://on.wsj.com/4iiembL | The Wall Street Journal

The spleen acts as a inspection center for red blood cells. Blood flows through narrow channels inside the spleen, forcing red cells to squeeze through tight spaces. Healthy cells pass through easily because their membranes are flexible. Older red cells have stiffer membranes and become trapped. Once trapped, they are examined by phagocytes, which are immune cells specialized in removing damaged material. The phagocytes engulf the worn out red cells and break them down inside enzyme filled compa

That time in The Day of the Doctor when the Eleventh Doctor (Matt Smith) met the Tenth Doctor (David Tennant). Every Doctor, every companion, every enemy. Discover the Whoniverse. Only on #iPlayer. #DoctorWho #DoctorWhoDay #DavidTennant #MattSmith The Day of the Doctor: The Doctors embark on their greatest adventure in this anniversary special. All of reality is at stake as the Doctor's dangerous past comes back to haunt him. | BBC One