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galaxies

A galaxy is a system of dust, gas, and stars that collects over a very large area. Gravity binds the objects in a galaxy together. Within each galaxy are billions of stars. ... read more

how to make the ultimate sword

Discover the ancient art of forging a deadly weapon ... read more

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

how does chlorine clean swimming pools

The chemical reaction that stops swimmers from getting sick. ... read more

anatomy of a spanish conquistador

How a small army of Spaniards brought an entire civilisation to its knees. ... read more