The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.

   

Adam & Eve

Imagine a woman who is the most recent female ancestor that you and I share. Let's define this relation as our "grand-eve". If you're Heather (my sister), our "grand-eve" is our mother. Depending on how closely related you are to me, our "grand-eve" might be your grandmother, your great-grandmother, your great-great grandmother, etc...

Now consider the man who is the most recent male ancestor that you and I share. Let's call him our "grand-adam".

Three questions to ponder: Is it necessarily the case that you and I have a grand-eve? Is it necessarily the case that you and I have grand-adam? And finally, if you and I have a grand-eve and a grand-adam, must they have known each other?


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