Using microwaves to kill malaria parasites and developing a way to give fetuses immunity to HIV are among the dozen ideas the Bill & Melinda Gates Foundation thinks are worth more research dollars, after giving more than 500 scientists seed money to take an initial look at some far-out concepts. A dozen scientists or teams of researchers will each get an additional $1 million over five years to take their ideas to the next level and see if they have the potential to save lives, the foundation...