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how much stronger is carbon fibre than steel

Carbon fibre can be stronger than steel but is far lighter. ... read more

how to make the ultimate sword

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

what is humidity

Discover the cause of uncomfortable, muggy weather that leaves you sweating. ... read more

why does looking at the sun damage your eyes

Never look at the Sun unless you are using specially designed glasses that are intended for this purpose. ... read more

how do polarised sunglasses work

Polarised sunglasses have filters that block some light waves while letting others through. ... read more