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Cosmo and I learn about shots—and new technology our friend WSU's Roland Chen is working on to make painless vaccines.

• Learn more about microarray patches 
• Find out how vaccines work with the Amoeba Sisters and why we get vaccines with SciShow Kids
• Check out how other vaccine technology gets rolled out, from Ted-Ed

As always, submit burning questions at askdruniverse.wsu.edu. Who knows where your questions will take us next.