11 May, 2005

Prestidigitation

This will test how you think; specifically, your ability to question the ground rules.

Try this 'ESP Test'.  You'll be asked to mentally choose a card from six offered, concentrate on it, then click on any of six buttons elsewhere on the page.  That will take you to a page showing five cards.  The one you chose won't be one of them.  Guaranteed.

The same site has a huge number of explanations contributed by visitors, but they'd all feel rather foolish if they'd spotted one simple fact.

Think about it: how could one guarantee that any one card chosen from the first page will be absent from the second?