Windows pose a perpetual privacy problem. You want lots of light but you also want a sense of privacy. This clever hack turns a cheap cotton sheet and some starch into an effective but easily removed ...

A new window coating absorbs the sun’s warm near-infrared rays in the winter and reflects them in the summer while keeping the glass transparent (ACS Photonics 2021, DOI: 10.1021/acsphotonics.1c01128) ...