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Bandana-style masks 'significantly worse' than homemade cotton coverings

Daily Mail - Science & tech

Cone-style well fitting masks and home-made coverings made from multiple fabric layers are the best designs for stopping the spread of coronavirus, study shows. Researchers from Florida Atlantic University examined different materials and designs to find the best option for slowing the spread of virus carrying droplets. These droplets are expelled when someone with COVID-19 coughs or sneezes and tests show loosely-folded masks and bandana-style coverings perform the worst. According to researchers this is because those designs provide minimal stopping-capability for respiratory droplets which can spread up to 8ft if unobstructed. They found a simple bandana-style mask can stop droplets going more than 3ft but a homemade well-fitting cotton-fabric stitched mask stops droplets at 2.5 inches.

Naked droplets for culturing cells


Cellular behavior and interactions are best modeled in vitro using 3D constructs because they closely mimic in vivo environments. Both scaffold and nonscaffold techniques have been developed, but these methods can be time consuming, expensive, or hard to do reproducibly. Chen et al. show that low-volume droplets, placed inside superhydrophobic coated plates, create a medium in which cells can float freely and rapidly grow into spheroids.

Droplets don't have to be round – here's one squished into a square

New Scientist

DROPS of liquid are usually round, but they don't have to be. Researchers sandwiched drops of glycerol between stretched elastic films to see what shapes they could make – and were surprised to produce a square. Rafael Schulman and Kari Dalnoki-Veress at McMaster University in Canada started with a thin film lying flat on a silicon surface, and deposited a droplet around 100 nanometres in diameter on top. Then they placed a second film over the droplet.

Scientists have finally come up with a solution for the world's most annoying household sound


It haunts you when you're trying to eat your dinner in peace. It disturbs you when you're trying to watch TV. It even keeps you awake in the wee small hours. It's the insufferable, interminable drip-drip-dripping of a leaky tap. Well, scientists at the University of Cambridge have finally figured out what's causing what is almost certainly the world's most infuriating sound.

What the heck are white rainbows, and where do they come from?

Popular Science

A photographer in the United Kingdom recently came upon a striking white rainbow hovering over Rannoch Moor in Scotland. Melvin Nicholson and a friend had just arrived at a tree he was hoping to photograph when they witnessed the phenomenon, he told ABC News. "The sun started to rise behind us, burning off the mist, and at that point, the fogbow appeared," he said. "I had never seen anything like it in my 10 years capturing landscape photos around the globe." White rainbows, which resemble normal rainbows with the color leached out, emerge from fog that is thin enough to be pierced by sunlight.