Last week magician David Blaine completed a stunt “where he spent…72 hours standing inside an artificial
lightning storm generated by seven high-voltage, low-current Tesla coils,” on a stage 20 feet above a New York City pier. This
is not magic; it’s science. The most
amazing thing about it was his ability to stand upright for three days without
food, not the special effects created by the artificial lightning show.
If you visit a science museum
(or check YouTube) you may see an example of a Faraday cage. In a science museum, they don’t try to pass
it off as magic; they explain how it works.
A Faraday cage is a hollow conductor where the charge remains on the
external surface of the cage while the interior has no charge. Static electricity striking the outside of
the cage stays on the outside. Anything
inside the cage is not affected.
There are practical uses for
this scientific knowledge, but a magician may also use it to put on a
spectacular show with a million volts of artificial lightning, trying to scare an
audience into believing that he is in some physical danger. As is the case with most magic tricks, this
is a harmless illusion created by using ingeniously designed props. It did not, however, get the ho-hum response it
probably deserved from what I’ve described before as a “scientifically unsophisticated populace.” This general lack of
scientific understanding can lead to serious consequences, health-wise, financially or both, when advantage is taken not by magicians for entertainment purposes,
but by unscrupulous businesspeople or charlatans.
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