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if a nucleus were the size of a marble how big would the atom be

If an atom’s nucleus were the size of a marble, the atom would be over 120 metres across. ... read more

the universe

The universe is everything. It contains all galaxies, stars, planets, and matter that have ever existed or ever will exist. Everything you can possibly think of is part of the universe. The cosmos is another word for universe. It is impossible to imagine the size of the universe. Think of words like h... 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

what is data roaming

Data roaming enables you to connect your smartphone to the internet when you are in other countries. ... read more

panning for gold

How the 49ers found fortune in the famous Californian gold rush. ... read more