Thanks to Laughing Squid and Twitter, I noticed that there is a great video of "kittens learning physics." I had to post this because, as some of you know, I adopted a kitten and my life right now is somewhat influenced by the experience (to put it mildly). Enjoy.
Below and on the left is a picture of Felix resting her (yes, Felix is a girl) head on my laptop as I work. It does not help with productivity. The right is a video of Felix chasing her tail.