In practical use, a material only needs to be as strong as required, with factors like lightness, ease of manufacture, and sustainability guiding selection. Although paper, as a raw material, is on ...

Paper-based diagnostic tests such as rapid COVID-19 assays have broadened access to diagnostic tests beyond the lab. But historically, they have been limited to a binary readout: either yes or no. At ...

Cars line up at a drive-in coronavirus testing site in Miami Gardens, Florida, in late June. Testing in many states has been hampered by bottlenecks and long delays, problems that could be eased by ...