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Tools:
One 3 x 5-inch index card or simlar size piece of paper.
One pair of scissors.
The Effect:
Hold up the small index card or piece of paper and say, "Do you believe that I can put my head through a hole in this 3 x 5-inch index card?" Amaze your friends and astonish your family by doing it!
The Method: (Note: Click on the images below to see full-size illustrated instructions. Click the "Back" button on your web browser to return to this page.)
The Secret:
Step 1
Fold the file card in half lengthwise.
Step 2
Make 13 partial cuts widthwise through the folded side of the card. Cut to within a quarter inch of the edges of the card.
Step 3
Turn the card around and cut toward the fold. Again, cut to within a quarter inch of the edges of the card.
Step 4
Very carefully open the card and cut lengthwise along the fold. Do not cut the two end sections.
Step 5
Gently stretch the card as far as it will go and put it over your head!
The secret to this trick comes from a branch of mathematics called topology. It teaches that figures can be stretched without changing their area.
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