There was once a boy named Ali and his younger brother, Adam.

They lived in a rural village in the deep jungle.

Behind their house, there was a beautiful river stream surrounded by banana palm trees.

Ali loved playing by the river with Adam.

One day, Ali found a fallen banana tree by the river.

Adam! Adam! Look, this big banana tree fell!

Out of curiosity, Ali and Adam looked closely to inspect the tree. The tree has broken into many different pieces.

Adam, this is a long banana stem. Let's play with it! Let's put it in the river and see what happens!

Adam helps Ali pushed the banana stem to the river and they see that it floats to the surface of the water. 

Look, it floats!

Adam grabs a pebble and throws it in the river.

It sinks!

The next day, Ali and Adam go swimming in the river. 

Ali and Adam love to swim.

Please don't go there! We don't have a life jacket with us now. It's dangerous!

Ali, I want to swim in the deep part of the river.

Okay, I won't go there...

Both of them continue playing and swimming happily.

While Ali was distracted, Adam sneaked to go to the deep part of the river.

"I really want to go to the deep part. It's only for a short while" Adam thought

Suddenly Ali heard a shout from the deep part of the river.

"Help me, Ali! Sorry I didn't listen. This water is too deep for me!" Adam shouted.

Ali! Help! Help!