Happy Earth Day!

Earth from the Moon, taken by Apollo 8 crew on Dec. 24, 1968 - NASA public domain

So fitting that this day follows John Muir's birthday, which is an additional reminder of the importance of taking care of our home.  This year's Google Earth Day doodle is another fun interactive one - read instructions here to enjoy all its features. "Be it ever so humble, there's no place like home!"