Influenza, also known as the flu, is a viral infection marked by fever, headaches, muscle aches and a cough. Flu season runs from November to March, with a flu vaccine available in early fall. In the US, influenza kills tens of thousands of people. Experts are warning us that is it especially important to get a flu shot this year during the Covid-19 epidemic in order to reduce the number of serious flu cases that end up in the hospital. Learn more at this week’s mix of sites, some created just for kids, and others for learners of all ages.