After making a vaccine for coronavirus, you have to get it to the masses. But that’s not so easy for a so-called cold chain vaccine, requiring exacting temperatures across its journey. It also takes two shots. Vaccinating much of the…

SciShow is supported by Brilliant.org. Go to to get 20% off of an annual Premium subscription. Multiple companies and organizations have announced early results about their COVID-19 vaccines. Here’s what we know about Pfizer’s. Hosted by: Hank Green COVID-19 News…