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How it works

how do polarised sunglasses work

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

how the body work

All the organs and systems of your body work together. When they work correctly you move, you fight off germs and diseases, you heal, you learn, you grow, and you age. In other words, you live. ... read more

how much stronger is carbon fibre than steel

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

weather

We talk about the weather every day, but what exactly is it? We can define it as the state of the atmosphere. The amount of wind, the temperature, the moisture, and cloudiness are some of the things that make up weather. ... read more

why don’t grains of salt stick together

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