The concept of warm-blooded and cold-blooded animals is outdated because there are actually tons of different animal thermoregulation strategies. Find out more in this enlightening video from Minute Earth.

[MinuteEarth]

There’s a vaccine being developed now that would protect you against every strain of the flu— even ones that don’t exist yet. But influenza is constantly mutating, so is a universal vaccine even possible? And how do you design a vaccine that will be effective against future strains? Explore how scientists are developing new ways to help our immune systems fight viruses.

[TED Ed]