that thing that's in your house, probably on all the time, connected to your mobile phones and wireless devices i.e. WIFI ... it kills cress. Or rather five girls from form 9b in Hjallerup School in North Jutland DK have found that, "If you're trying to grow cress don't put it near the WIFI router."
[forwarding source TAP]Okay, got that?
cress grown away from WIFI
cress grown beside WIFI router
“It is truly frightening that there is so much affect, so we were very shocked by the result”, says Lea Nielsen, one of the girls.
NOTHING WRONG WITH WIFI then, it's totally safe.