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how to make the ultimate sword

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

how does chlorine clean swimming pools

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

welcome to venus

The hellish world often described as Earth’s evil twin. ... 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

how to make a soap powered boat

Propel a paper boat using nothing more than washing-up liquid! ... read more