UNVERIFIEDDate confidence: UNVERIFIEDNo wording about the date was foundHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all UNVERIFIED pins40% CONFIDENCEOverall confidence: 40%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 49% confidence or below
A group of researchers funded by a Japanese government program develops “industrially compatible” cells. The silicon-based cells that make up a solar panel have a theoretical efficiency limit of 29 percent.
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