Not all scientists think that genetically modified mosquitoes are such a good idea. Some scientists think there are too many genetic puzzles to be solved for modified mosquitoes to work. For example: the malaria-causing parasite, which mosquitoes then transmit to humans, is simply too good at evading anything scientists might devise to protect the mosquito. Whenever mosquitoes have developed genes resistant to the malaria-causing parasite, the parasite has always found a way around it.

For genetically modified mosquitoes to work, scientists will have to genetically modify billions of these mosquitoes. And as it is usually the case, some environmentalists are worried that genetically modified mosquitoes might wreak havoc in the ecosystem. "Can't we just give mosquito nets to people instead of looking at these really complex technological fixes that mess with the very delicate balance of nature and evolutionary history?" asked Gillian Madill, a genetic technologies campaigner at Friends of the Earth in Washington.

Scientists at London's Imperial College have genetically modified hundreds of mosquitoes hoping to stop them from spreading the malaria killer disease. The Bill and Melinda Gates Foundation has found the work so promising it has invested nearly $40 million into genetic strategies to stop mosquitoes from transmitting diseases like malaria and dengue fever.

To read more on this head here: Genetically Modified Mosquitoes to Wreak Havoc in Ecosystem.