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A couple of weeks ago there were reports of an experiment by schoolchildren that appears to demonstrate that wifi router radiation adversely affects cress. There's been time now for the

leading researchers from the United Kingdom, the Netherlands and Sweden [who] have shown great interest in the girls’ project

to have reproduced the experiment, but I cannot find any follow-up story amidst a Google-load of conspiracy-theory sites. Has this experiment been reproduced, or indeed debunked?

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The article you cite is from 17th of May 2013 and presumably the experiment itself was done relatively recently. To reliably reproduce any experiment it takes more than a couple of weeks, not to mention peer review etc. –  Rabbit Jun 1 '13 at 17:29
    
@Rabbit Doesn't mean it isn't a good question, though. –  matt_black Jun 1 '13 at 19:16
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"We all thought we experienced concentration problems in school if we slept with our mobile phones at the bedside, and sometimes we also found it difficult sleeping"... wow, talk about confirmation bias... Anyway, the experiments needed at least to be reproduced by switching rooms. –  nico Jun 2 '13 at 14:40
    
I worked on a radio link between 2 locations ~15km apart, every spring we had loss of signal because a tree in the middle raised. The signal did not killed the leaves, the leaves interrupted the signal without any visible damage to them (except the fact we trimmed the tree). –  Radu Maris Jan 7 at 12:35
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up vote 17 down vote accepted

Norwegian science journalist Gunnar Tjomlid published an article [Norwegian language] in the online newspaper Nettavisen.

Blogger Pepijn van Erp summarised it in English.

In brief, the experiment was not properly controlled, not blinded, had publication bias, was misreported, had faulty statistical analysis, had bias in the methodology and relied on a cherry-picked hypothesis.

The WiFi and control group were not just different because of the presence of the routers. On the pictures in the report it can be seen that also the laptops in the WiFi group were placed quite near to the plates. It’s very likely that this had an effect on airflow and temperature around the plates and that could have an effect on germination, which has nothing to do with the presence of EM-fields.

[...]

A second experiment in which the laptops had been ‘pinging’ each other constantly did not show the dramatic difference in germination. Only the first experiment was used in the report

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