‘The possible ranks higher than the actual.’ –Heidegger
In 1922, Scientific American made two US$2,500 offers: (1), for the first authentic spirit photograph made under test conditions, and (2), for the first psychic to produce a “visible psychic manifestation.” […]
Since then, many individuals and groups have offered similar monetary awards for proof of the paranormal in an observed setting. These prizes have a combined value of over $1.69 million dollars.
As of August 2012, none of the prizes has been claimed.