It is science week.

 Today our experiment involved an egg, a plate and an empty plastic bottle.

 We would like to get the yolk into the bottle. First we broke the egg onto the plate.

 Then we squeezed some air out of the bottle.

 Next we put the opening of the bottle over the egg yolk.

As the air sucked back into the bottle it took the egg yolk with it.

 Hey Presto!

 Now we squeezed the air out of the bottle again.

 Plop! The egg yolk was pushed out with the air onto the plate.

 We all watched this experiment several times.