So my cousin had to have his knee replaced. It’s amazing these days how quickly he is back on his feet. A week after surgery and he’s home and although it takes him awhile to get to his feet, carefully, he can walk. Not that he’s jogging or anything. Every day a therapist comes and works with him. Because it takes him awhile to get up, he leaves his front door open, and just the storm door. So someone knocks on the door and he calls, “Come in!”

Monday, they were Jehovah’s Witnesses.

Useful in the event of Zombies.

Here is something fun—an animated graphic that shows you the scale of the universe, from big cosmological structures all the way down to clusters of quarks in an atomic nucleus.

There are a number of these scale tutorials around on the web, but this one is especially well done. (They top out at our local group of galaxies. If they went all the way up to the biggest scale, it’d be perfect.)