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Aleph-Null animal Asimov's Science Fiction Bagel barber BARBERPOLIA black hole blue called cards cell coin color Couth cube cylinder David Slowinski digits dime Dirac divided Earth elevator Ensign Pulver Evenoder face five Flanagan Flarp formula four Fred galaxy gold talent graph green H T H Hustle infinite integers king L-sphinxes letters line segment look magic constant magic square marble Mars Martin Gardner Mathematical Matsu Mersenne prime mirror moon move multiple naked singularity odd number orbit original numbers paradox parity path Pentomino perfect numbers pieces pile planet planiverse plank play player polyomino problem Pulver puzzle quadruple question rep-tiles reverse rotation S. L. Greitzer science fiction scissors Second Answers section sequence shape side Snaag solar system Solomon solution spaceship spell sphinxes surface area Tanya Thang Third Answers section triangle trick triplet turn Venus VZIGS word