potassium thiocyanate /oss/taxonomy/term/7627/all en Pick A Card, Any Card! /oss/article/history-general-science-reviews/pick-card-any-card <p>The curtain went up in “Heller’s Wonder Theatre” on Broadway to reveal a blindfolded lady comfortably seated center stage. A volunteer from the audience was solicited to “pick a card, any card!” She did so, thinking of course that it was a free choice. It wasn’t. Robert Heller, the premier American magician of the mid 19th century, was highly skilled at “forcing” a card. There was nothing really novel about that, but his revelation of the selected card was truly innovative. Heller resorted to chemical magic!</p> Wed, 26 Jun 2024 22:59:16 +0000 Joe Schwarcz PhD 9988 at /oss