When Paul got a stiff back and had trouble bending his neck, he hoped and dreamed that it would be Polio. Then his body was naughty and stopped his lungs from breathing! Luckily, he got to spend lots of time in an Iron Lung - a huge machine that helps him breathe by applying a vacuum to his entire lower body. When his friends come over, they all gather round the Iron Lung to play Astronauts and Paul gets to be Michael Collins
while his friends pretend to be Neil and Buzz!