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people who study chemistry

Hundreds of years ago, people called alchemists used chemical reactions. They used them to make medicines and combine metals. Some of them thought they could create gold from other metals. Some of them thought they could make people live forever. Unfortunately, they were wrong. Today, we know a lot mo... read more

humans

Scientists classify humans in the animal kingdom. We belong to the subphylum Vertebrata. This means that we have spines or back bones. We are in the class Mammalia (mammals), animals that nurse their young. Humans are in the order Primates. They are omnivores with opposing thumbs and a big brain. The ... read more

health and illness

People are healthy when all of their body parts work well. Most of the time, we can stay healthy by eating good food, using our muscles in exercise, getting plenty of sleep, and resting if we start to feel sick. But sometimes, we can suffer injuries or become sick even when we take care of ourselves. ... read more

the solar system

A solar system is a group of planets and one or more stars. Our solar system has just one gigantic star, the Sun. It also has eight planets and three dwarf planets. Many planets have their own moons. There are also thousands of asteroids, meteoroids, and comets. Gravity from our huge Sun holds the sol... read more

energy

Work ... read more