Usage Note
rätseln means to be perplexed by something and attempt to figure it out. Often used with über: über etwas rätseln. More colloquial than grübeln and implies a lighter, curious puzzlement rather than anguished brooding.
Examples
"Die Wissenschaftler rätseln noch immer über die Herkunft des Signals."
Natural Translation
The scientists are still puzzling over the origin of the signal.
Literal Translation
The scientists puzzle still always over the origin of the signal.

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