The Best Of Our Knowledge #1135

You can’t see them...but they’re there.  Billions of microscopic life forms just waiting for their chance to grab hold of something and start to grow.  And that includes you.  Today on The Best Of Our Knowledge, our astrobiology series gets small with a look at the tiniest life on the planet...and how it fares while off the planet.

We’ll also spend an Academic Minute dealing with the issues caused by space travel.