More-efficient solar-powered steam
Can convert 85 percent of incoming solar energy into steam, eliminating need for complex, costly systems to highly concentrate sunlight
Noninvasive retinal imaging device detects Alzheimer’s 20 years in advance
Device could be FDA-approved by 2015 and early signs of Alzheimer’s could be detected in a regular ophthalmologist exam
Generating electricity from water droplets
Camping-cooler-size device could charge a cellphone in 12 hours