Ongoing coverage of the Chicago Teachers Strike

The John Williams NewsClick: Does using your cell lead to cancer?

WaveZorb, placed on the earpiece of this cellphone, on Monday Aug. 28, 2000 in Pittsburgh, is a black oval adhesive pad being marketed by Calgon Carbon of Pittsburgh. The manufacturer says WaveZorb blocks about 99 percent of the microwaves entering the caller's ear canal.(AP Photo/Gene J. Puskar)

The Chicago Tribune set out to do its own research on radio-frequencies of varying cell phone brands.

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