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How dangerous is a microwave?

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Prolonged exposure to significant levels of microwaves is known to cause "cataracts" in your eyes, which is a clouding of the lens preventing you from seeing clearly (if at all!)

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Some research in the past has indicated that the small doses of microwaves from mobile phones might affect parts of your brain - after all, you're holding the transmitter right by your head.

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Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between 300 MHz (100 cm) and 300 GHz (0.1 cm). Different sources define different frequency ranges as microwaves

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Microwaves are used to cook/warm up food. Microwaves are also used for wifi. Radars and traffic cameras use microwaves to find out how far away objects.

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Microwaves are basically extremely high frequency radio waves, and are made by various types of transmitter.

In a mobile phone, they're made by a transmitter chip and an antenna, in a microwave oven they're made by a "magnetron".

Their wavelength is usually a couple of centimetres. Stars also give off microwaves.