Haha this is such a weird experiment I did. I really love the idea that physics education could be like a fantastic fantasy quest where you use physics to solve problems.

Your interstellar spaceship is nearly complete! Only one technical challenge remains: finding a power source.

You’ve tried fusion, fission, rocket fuel, and even briefly accepted the generous offer of a thousand badgers to power your ship by running on their tiny treadmills. But none of it generated enough power for the voyage you want to undertake.

There’s only one way left to try.

You need the power of an entire star.

Once upon a time, on the oily shores of the Many-Layered Sea, there lived a girl named Sakura. You might think that an oily sea sounds worrisome, as if it were the result of a spill or disaster, but this was simply how the sea was. The top-most layer was a quarter-mile thick of oil and plentiful with swarms of oil eels. Which were delicious.

One day, lost in the woods, Kip came across a fairy with a mischievous glint in her eye. She looked like the type of person who would know her way out of the woods. He had been lost for many weeks, and he hoped this fairy would tell him the way out of the gloomy forest. Not in the least because there was something with glowing red eyes following him. But the fairy refused, unless Kip could correctly answer her questions.