It’s almost that time of the year again. Everybody’s favorite season after spring, summer, fall and winter: flu season. Here we have NPR’s Robert Krulwich and medical animator David Bolinsky explaining exactly how these pesky viruses enter and try to take over cells within your body. It’s a tale of deception, transformation, war and victory. Next time you’re sitting there feeling miserable, achy and snotty nosed whilst binging on daytime television and cough drops, give a little thought for your awesome immune system.