Related by context. Frequent words. (Click for all words.) 43 dilemmas 41 quandaries 41 riddles 40 riddle 40 differential equations 40 chapter headings 40 Rubik cube 39 conundrum 39 mysteries 39 conundrums 37 interdisciplinary collaboration 37 puzzle 37 whodunit 37 unsolvable 36 brainteaser 36 moral quandary 36 paradoxes 36 impossibilities 36 paradox 35 CAPTCHAs 35 solves 35 mathematical concepts 35 externality 35 whodunnit 35 solving 35 moral dilemma 34 puzzles 34 ethical dilemma 34 anagrams 34 theorems 34 mystery 33 ethical dilemmas 33 inherent contradictions 33 moral dilemmas 33 Mad Libs 33 etymological 33 mathematical equation 33 dilemma 33 dualism 33 David Krumholtz 33 solution 33 Sudoku puzzle 33 crossword puzzle 33 disjunction 33 complexities 33 Complexities 33 solvable 32 crises 32 cube 32 practical 32 deceptively simple 32 yuck factor 32 mathematical equations 32 vexing 32 phyllo 32 Solving 32 tautology 32 knotty 32 plotlines 32 complexity 32 brainteasers 32 bite sized 32 phyllo dough 32 tradeoffs 32 Debugging 32 Solver 32 Restorative justice 32 Network Address Translation 31 Rubik Cube 31 Gordian Knot 31 colorful illustrations 31 simile 31 cognitive dissonance 31 brain teasers 31 enigmas 31 awkward silences 31 cubes 31 urgencies 31 thornier 31 problem 30 troubleshooting 30 proverbs 30 Troubleshooting 30 myriad 30 human genome sequence 30 messiness 30 crossword 30 societal ills 30 interdependency 30 challenges 30 anagram 30 whodunits 30 syllogism 30 metaphysics 30 thorny 30 jigsaw puzzle 30 confusions 30 love triangle 29 flowchart 29 puzzlers 29 cubing