## What Is Riding on Water?
Many kids dream about fish under the water, submarines, or water bikes that glide on top of the water. Riding 40.74 kilometers on water might sound like an action scene from a movie. In real life, it was made possible by a mix of engineering, physics, and bravery.

## Who Did This Adventure?
The adventure was done by Chinese engineer and founder of the motorcycle company ZXMOTO, Zhang Xue. He tried the challenge on the Jinjiang River. In 2009, when he was 22, he fell into the water four times on his first try, but he didn’t give up. Fourteen years later, after five months of testing and improving, he rode 40.74 km on water and became the new Guinness World Record holder.

## How Does a Water Bike Work?
A normal bike can’t ride on water, but Zhang Xue’s special bike is built to be water‑proof. Here are some important parts:
- **Water Skis**: Flat boards attached to the back that let the bike glide on the surface.
- **Big Fuel Tank**: Holds extra fuel so the bike can travel a long distance.
- **Water‑Proofing**: Special coatings protect the engine and electronics from getting wet.
- **Special Shaped Rear Tire**: Pushes against the water to move the bike forward, helping it stay on top of the water.

## Why Is This Important?
The record is not just a cool fact; it also inspires us to explore the world above and below the water. Kids can learn how something can move on water, how water behaves, and how engineers make amazing machines.

## Science Bits
- **Water Density**: Water is heavy – 1 litre of water weighs 1 kilogram – which helps create the push needed to glide.
- **Hydrodynamics**: The water skis change the flow of water, reducing the drag that slows the bike down.
- **Energy Source**: The engine burns fuel to create energy, which pushes the bike forward on the water.

## Did You Know?
- The oldest vehicle that could ride on water was a water bike invented in the 19th century.
- Water skis are considered the first invention that let people glide on water.
- Water is most dense at 4°C, so temperature matters when you ride on it.

## Questions Kids Might Ask
1. **How does a water bike stay water‑proof?**
- It uses waterproof coatings and materials so the engine and electronics don’t get damaged.
2. **How much energy is needed to ride on water?**
- Fuel use depends on the bike’s speed and the water’s density. This project used a specially designed engine.
3. **Where else could a bike like this be used?**
- It could be used for water sports, underwater exploration, and water‑based tourism.

## How It Touches Kids' Lives
This story expands kids' imaginations and encourages interest in science, technology, engineering, and math (STEM). Riding on water is a fun example that helps kids understand how water works.

## Summary and the Future
Zhang Xue’s water bike adventure opened the door to new discoveries on the water’s surface. Projects like this help us learn more about the worlds above and below the water. In the future, faster, safer, and greener water vehicles may be built. Kids can follow these inventions and turn their own dreams into reality.