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why don’t grains of salt stick together

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

why are circles 360 degrees and not a round number

Circles have 360 degrees due to the Sumerians’ observations of the Sun’s motion across the sky. ... read more

types of plants

There are many kinds, shapes, and sizes of plants on Earth. Among them, algae, mosses, liverworts, ferns, and some trees are non-flowering plants. Among the flowering plants are the grasses and other non-woody, herbaceous plants. Shrubs, some vines, and many kinds of trees are woody plants. ... read more

do fish sleep

Fish do go to sleep, but in a rather different way to humans. ... 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