Galileo's Pendulum

Before I dive into other subjects this afternoon, I wanted to point out my first post at Double X Science is live! For those of you who follow the blog regularly, it’s a re-run of something I posted a few weeks ago here, but I’ll be contributing original content to Double X very soon. Please go check them out, and especially support the second half of the project, Double X Science Jr., which is written by and for girls (though everyone else should have fun reading it too!).