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The stars you can see at night are “fixed stars” that emit their own light. The Sun is one of them. Because starlight travels from very far away, stars look small and twinkle. In fact, there are many stars that are larger than the Sun.

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Cats can distinguish differences in the pitch and tone of human voices. They can also remember and respond to frequently heard words like “come here” or “food.” However, because cats can be moody, they often pretend not to hear even when they do. Another impressive trait is their excellent hearing, which lets them quickly locate the direction a sound is coming from.

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In the past, people used shells, cloth, and rice instead of money. In Japan, metal sheets of gold and silver were also used as “old money.” As time went on, money became coins and paper, and today it can even be exchanged electronically through cashless payments.

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Ladybugs are not only cute in appearance; they are also helpful to people. This is because they eat the aphids that infest crops in the fields. That’s why farmers say, “Ladybugs are allies of the fields.” Even small insects play important roles in nature.

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The heart works like a pump that sends blood throughout the body. It beats about 70 times a minute, which adds up to over 100,000 times a day. It keeps working even while we sleep. If the heart stops, blood can’t circulate through the body, so it’s a very important organ.

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The sun keeps shining even at night. The reason we can’t see it is that the Earth is rotating on its own. During the day, it’s bright because sunlight hits us, and at night it becomes dark because we’ve turned to the opposite side. In other words, the sun never stops and is always shining.

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Chameleons change the color of their bodies depending on the surrounding brightness, their mood, and temperature. Their colors change not only to blend in with their surroundings but also to express their feelings or signal to others. For example, when they are angry, they may turn reddish.