If you haven't seen the video of a wet towel being wrung out in space yet, it provides a great opportunity to test some basic rationality skills.
Skill #1: Notice the opportunity. (I failed this test. I had a fuzzy, wrong idea about what would happen. I didn't notice the fuzziness of my own thinking until after I watched the video, when it was too late to apply basic rationality skills. I'll never know if I could have made a correct prediction.)
Skill #2: Enumerate possibilities.
Skill #3: Incorporate prior information.
Skill #4: Making clear predictions.
Skill #5: Understanding why/how your prediction failed/succeeded.
Skill #6: There may be some things you predicted and some you didn't. Don't forget to notice the partial failures along with the partial success.
You are on the International Space Station. You get a towel soaking wet, then you wring it out. What happens?
If you haven't seen it, don't scroll into the comments.
Don't click the link until you've thought about it!