English
中国人
ខ្មែរ
Prince Kael lived in a silver Moon Base that floated above the grey lunar surface. Every day, he watched the Earth rise through the thick glass windows, and he wondered how living things worked inside their bodies. His tutor, a small robot named Luma, often told him stories about the human body. "Your heart is like a powerful engine," Luma said one morning. "It never stops, even when you sleep."
"But how does the heart move blood?" Kael asked, curious. Luma projected a glowing image of a red blood cell named Ruby. "Ruby travels through tubes called arteries," Luma explained. "The heart pumps blood through these arteries to every part of the body. The blood carries oxygen and nutrition to your muscles and brain." Kael watched Ruby squeeze through a narrow artery and then rush into a wide chamber. "It's like a busy space station," he said. "Exactly," Luma replied. "And every cell needs those supplies to survive."
