Researchers in 17 countries have won $100,000 each from the Bill and Melinda Gates Foundation to develop their unconventional ideas for improving health in the developing world. The 81 projects range from the straightforward, such as creating an insecticidal paint to keep malarial mosquitoes under control, to the very ambitious, such as developing antibodies that can be injected to block HIV infection. Three thousand applied for what was the second round of grants in the foundation's Grand Challenges Exploration initiative; the deadline for round three applications is 28 May.
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