Why You Need a Flu Shot Every Year - A TED-Ed Science Lesson

This morning Lifehacker ran an article encouraging people to get a flu shot (the title of the article is not school-appropriate so I won't link to it). The point of the article was to remind people that getting the flu shot isn't just about them, it's also about helping to keep your community healthy. Reading that article reminded me a TED-Ed lesson titled Why Do You Have to Get a Flu Shot Every Year?

Why Do You Need To Get A Flu Shot Every Year? does a god job of succinctly explaining how influenza changes and why a new vaccine is developed every year.