CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Mobile phone masts on top of a block of flats in Finsbury Park, London, England. These masts bear antennas that receive, strengthen and transmit mobile phone signals. Their placement on or around residential buildings is controversial because of claims that low-level microwave radiation emitted from the antennas may harm people's health, particularly that of children.
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