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endangered species

Life on Earth exists in a balance between the environment and the plants and animals that live on it. Throughout history, animals have become extinct when the environment changed. Scientists have discovered and documented many animals that have become extinct by studying fossils. Today, many species o... read more

what is life

Look around you. All the stuff, or matter, in the world is either living or non-living. Stuff such as rocks, metals, plastic, water, and air are non-living. ... read more

waves, sound, and light

Light and sound are two of the most important forms of energy to humans. People see light and hear sound. Light from the Sun makes life on Earth possible. Sound is one of the most important ways that animals and humans communicate. Both sound and light travel as waves. Light also behaves like a partic... read more

why don’t grains of salt stick together

Common table salt doesn’t clump thanks to the addition of anti-caking agents. ... read more

the life cycle

The stages of human life are often described as a life cycle. For each individual, however, life is a straight line. Like a story, it has a beginning, middle, and an end. The earliest stage of life is a single cell. The cell divides and, with instructions from genes, forms different tissues. These tis... read more