speculate (verb)   

UK   /ˈspek.jə.leɪt/  US /ˈspek.jə.leɪt/

- to guess possible answers to a question when you

do not have enough information to be certain (has

multiple meanings)

Example:

People are speculating what caused the mushroom cloud formation.

https://dictionary.cambridge.org/dictionary/english/speculate

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