1. Lay a strong plastic
shopping bag on a table top or counter
top so its top third hangs over the
2. Place the large book on top of
the bag and ask your friend to sit
on top of the book.
3. Gather the open end of the shopping
bag into the shape of a balloon opening
4. Blow into the bag hard to fill
it with air to make a balloon. Keep
blowing to force the air into the
bag so that it inflates and pushes
or lifts your friend off the book.
This is the pushing power
works because air from your lungs
is spread over a wide area, so it
can support a lot of weight.