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Lava Lite
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You want to impress your friends while having a good laugh at the same
time. Check this out.
You can bet a friend that you can put your head through a hole in a
3-by-5-inch file card—and win!
Fold the file card in half lengthwise and make 13 partial cuts widthwise.
First cut through the folded side, then turn the card around and cut toward
the fold. Keep repeating the process. (Cut to within a quarter inch of
the edges of the card)
Very carefully open the card and cut lengthwise along the fold. Do
not cut the two end sections.
Gently stretch the card as far as it will go and put it over your head.
DID YOU KNOW?
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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