In today’s tutoring, we charted the different approaches to timeline change in various time travel stories including: Bill & Ted’s Excellent Adventure, Back to the Future (I wrote a paper once on those two), Terminator Genesys (and how it diverges from the typical Terminator approach to timelines), Awake all you Zombies, Click and The Men Who Murdered Mohammad.

We also discussed what the universe would be like if you increased the strength of the Nuclear Strong force a thousandfold, and the ways that hyperdense matter would collapse the universe around it.

Also: Word puzzles, Pythagoras, and whether, when one is caught in a Dolphinado, it’s better to be hit by the melon or the tail.