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Which French astronomer invented a Photo Revolver?

Correct answer: Pierre Janssen

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What people think about it: 3 Comments
BlueEyedAlien
BlueEyedAlien
Only one choice was a French astronomer.
little b
little b
I've not heard of Pierre Jansen
Unreal Neil.
Unreal Neil.
BlueEyedAlien, Too Easy.
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