THIS DAY IN SCIENCE: How Small Can You Go? in 1958

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Why do you need to get a flu shot every year? – TED-Ed

All year long, researchers at hospitals around the world collect samples from flu patients and send them to top virology experts with one goal: to design the vaccine for the next flu season. But why do we need a new one every year? Vaccines for diseases like mumps and rubella offer a lifetime of protection with two shots early in life; what’s so special about the flu? Melvin Sanicas explains.

Lesson by Melvin Sanicas, directed by Andrew Foerster.

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