What made Alice swim in a puddle of tears? 
Mathematics! 
As long division did for Dan in 4th grade. Math can bring tears, both of frustration and joy. What exactly is math? Why does it work so well in describing our universe? How can people explain mathematics apart from mind? And what's it all have to do with a grin without a cat? 
Come and see (or in this case, listen)! 
For more grinning from the heavens, see Wayne's article! 
https://creationanswers.net/answersblog/2023/01/27/the-grin-from-space/
Dan's full interview with Apollo 16 Astronaut Charlie Duke. 
 
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