Dangerous Nature

I need to get a hard hat to go with my laptop.  I decided to sit under a huge California Black Oak, from which this blog derives its name, and do some research on the world wide web.  It was nice and quiet in a part of the FRC campus that has lots of very large oaks.  A sudden wind arrived and this acorn landed on my head.  I brought it home and used my laptop case for a background and got this photo.  A reminder nature is not entirely benign.