Once upon a time, there was a planet called Helio. Helio was a special planet because it was made up of two gases, hydrogen and helium. The people who lived on Helio loved to send messages to each other using radio waves.
One day, a group of children were playing near a big crater on the planet. They noticed that the radio waves they were sending to each other were not reaching their friends on the other side of the crater.
The children were curious and decided to investigate. They climbed to the bottom of the crater and found that the radio waves were bouncing back, unable to cross the crater.
The children were smart and knew that helium is lighter than hydrogen and that it rises to the top of the atmosphere. They had an idea! They decided to fill the crater with helium so that the radio waves could travel through the helium and reach their friends on the other side.
The children gathered helium balloons and carefully released them into the crater. The balloons filled the crater and lifted the radio waves to the top, where they could cross over to the other side.
The children were so happy that they could now communicate with their friends on the other side of the crater. They celebrated by having a big helium-filled balloon party in the crater.
From that day on, the children on Helio always remembered the power of helium and how it helped them communicate with their friends. And whenever they saw a helium balloon, they smiled and thought about their amazing adventure on their special planet.
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