Eureka!

I do some of my best thinking in the shower. It's warm, there's a plethora of white noise and no major distractions. The one downside has always been the lack of paper. I might come up with a great idea, but I don't always remember it by the time I've run downstairs to find a writing implement.

Well, thanks to having a two year old kid, I now have the solution: The entire shower is a whiteboard!

These are Crayola Bathtub Crayons (and this is not a paid advertising post), and you can use them to write on the walls of the shower:

These are fantastic! Now, whenever I have a great idea in the shower I can just scrawl it on the wall, dry off at my leisure, then transpose it to a paper/electronic copy. And the stuff washes (mostly) off! Now, if only I could figure out a way to find the volumes of irregular objects, I'd be set!