This Sunday, I went to the Mathimatikum, an interactive math museum with a lot of interesting exhibits. Even though most of the signs were in German, the language of math seemed universal; you don't need to read the signs to enjoy watching wave back and forth in harmonic motion (trust me, it's not as nerdy as it sounds). The museum had everything from simply putting shapes together to comparing your body to a drawing of Da Vinci's to trapping yourself in a giant soap bubble.  The grand finale was an intricate sculpture that had a few dozen balls flying around through chutes and loops and tunnels. And hey, here is a video of some liquid in a spinning cylinder.

--Jacob