What is "conundrums"

Usage examples of "conundrums".

This is certainly a very appealing proposal for avoiding the mathematical, physical, and logical conundrums of a universe that emanates from or collapses to an infinitely dense point.

The temperature and energy are high, but not infinite, since string theory has avoided the conundrums of an infinitely compressed zero-size starting point.

Such messengers are said to deliver their messages in obscure forms, and so he tries to remember all of the riddles and paradoxes and conundrums he has ever known: The way down is the way up.