Affordability is crucial to the success of solar power. The sun has always been up to the task of powering our planet, with enough sunlight reaching Earth every hour to supply our energy needs for an entire year. However, humans have yet to find a way to convert light into energy sufficiently cheaply and efficiently. Read about World Community Grid and the Harvard Clean Energy Project, which recently released a database of 2.3 million organic compounds — 35,000 of which have promising properties for high-performance semiconductors that developers could use to make affordable photovoltaic cells.