How Are You Still Alive?

The Universe is conspiring to kill you.  You body is under constant attack.  But most days, you don't die.  You don't even get sick.  This is thanks to your enormously complex immune system.  Full of B cells, T cells and antibodies, your immune system fights off invading armies of bacteria and viruses.


This video by Kurzgesagt explains the basics of keeping you alive.  I could have used this during PY1.