Even if a mosquito somehow managed to penetrate such a barrier, a second light curtain set up around a bed, for example, would provide further protection. Dr Marka envisages two or three light curtains in a home: one at the door, one around a sleeping person and one surrounding the area in which mosquitoes typically hide (under the thatched roof of a hut, for example). Dr Marka calculates that if there is a 6% chance that a mosquito will penetrate a light curtain, and a hut contains four curtains, then only one in 100,000 mosquitoes will be able to spread malaria. Dr Marka, whose research is funded by the Gates Foundation, says that a prototype of his machine costs a little over $100.

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