This computational search engine went on line earlier this week. May I suggest that you start with something from the solar system? I’ve just spent an enjoyable couple of minutes comparing orbits and radii of planets and moons in our solar system. And I learned a new word today, eristic. Useful!
Wolframalpha.com
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Maps got to me. Cousin Gerald, you’ll love this. And earthquakes. Bookmarked. but I’ll have to ration my time here!