The Shockley–Queisser (S-Q) model sets a theoretical limit on the power conversion efficiency (PCE) of single-junction solar cells at around 33%. Recently, a PCE of 50%-60% was achieved for the first time in n-type single-junction Si solar cells by inhibiting light conversion to heat at low temperatures. Understanding these new observations opens tremendous opportunities for designing solar cells with even higher PCE to provide efficient and powerful energy sources for cryogenic devices and outer and deep space explorations.

From Chicago to Portland, James Comey to Letitia James, and so much else—this is no longer America.

In leaked recordings of private lectures by tech billionaire Peter Thiel he argued that “the Antichrist” is likely to take the form of a critic of technology.

Jordan Miller writes about the Trump administration dismantling the public-health sector through layoffs and removing health information.