Aha! It hertz!
http://www.abc.net.au/news/2016-01-19/scientists-discover-frequency-traps-male-yellow-fever-mosquitoes/7084434
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Aha! It hertz!
http://www.abc.net.au/news/2016-01-19/scientists-discover-frequency-traps-male-yellow-fever-mosquitoes/7084434