Off topic, but on the topic of your specific example: there's a nice book called The Horse, The Wheel, and Language[1] about this.

Great if you want to learn about analysing fossil horse teeth for bridle bit wear. Oh, and about Indo-European languages.

Edit: By 'you" I didn't mean parent specifically but "the reader".

[1] https://en.wikipedia.org/wiki/The_Horse,_the_Wheel,_and_Lang...