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people who study the earth

Throughout history, people have always wanted to understand the planet we live on. They wanted to know why the weather changes from hot to cold and back again. They wanted to know why it rains or snows and what lightning and thunder are. They wanted to know why volcanos erupt and why earthquakes move ... 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

electricity and magnetism

Electricity and magnetism are everywhere. Electricity is a form of energy. Magnetism is also a form of energy. They make it possible for televisions, computers, and many other electronic devices to exist. Medicine uses them to help treat illnesses in humans and animals. ... read more

poisonous plants

They may look harmless, but some species of flora can be fatal. It takes four castor seeds to kill a human, but 80 to kill a duck. ... read more

what is humidity

Discover the cause of uncomfortable, muggy weather that leaves you sweating. ... read more