Today’s invention is a tool for disrupting the lifecycle of the mosquito responsible for transmitting malaria.
A helicopter has a main rotor the blades of which can be reoriented so that, instead of driving air downwards through them, it pulls air upwards.
The machine is flown to a shallow puddle in which mosquitoes are known to be breeding (and which is probably too stagnant for safe drinking). It settles on the bottom of the puddle and runs its blades in reverse.
This sucks up all the water, mosquito larvae and all, dispersing the lot into a rising column of air within a few minutes -and thus greatly reducing the numbers of insects which reach maturity.