Related by context. Frequent words. (Click for all words.) 47 theories 43 puzzling 43 hypotheses 41 speculating 41 explanations 40 ponder 39 clue 39 clues 39 unanswered questions 39 hints 39 speculated 38 mystery 38 Clues 38 theorized 38 mysterious 38 conjecture 38 perplexing 38 speculate 37 wonder 37 riddle 36 mysteries 36 explanation 36 intriguing 36 plausible 36 curious 36 conclusive evidence 36 surmise 36 pondering 35 wondering 35 conspiracy theorists 35 wonders 35 speculations 35 definitively 35 puzzled 34 tantalizing 34 conspiracy theories 34 suggest 34 opine 34 debatable 34 hypothesis 34 rumblings 34 theory 34 worrisome 33 wondered 33 deduced 33 question 33 indications 33 interestingly 33 obvious 33 surprising 33 conclusively 33 suggests 33 troubling 32 Surprising 32 pinpointed 32 bandied 32 answers 32 cite 32 peculiar 32 causes 32 conclusive 32 causal 32 mystifying 32 reason 32 empirical evidence 32 begs 32 surmised 32 seem 32 explain 32 nebulous 32 conspiracy theory 32 circumstantial 32 unclear 31 speculation 31 puzzle 31 posited 31 strange 31 vexed 31 deduce 31 why 31 appears 31 reasons 31 Wondering 31 percolating 31 exists 31 murky 31 abounds 31 hotly debated 31 say 31 Question 31 interesting 31 wondered aloud 30 causation 30 Interesting 30 disquieting 30 seems 30 motive 30 fathom 30 hint 30 hypothesized 30 guesses