Extracting the best flavor from coffee

Espresso coffee is brewed by first grinding roasted coffee beans into grains. Hot water then forces its way through a bed of coffee grains at high pressure, and the soluble content of the coffee grains dissolves into the ...

Physicists develop a metamaterial that can count

A block of rubber that can count to ten and even remember the order in which it is pressed—physicists Martin van Hecke and Lennard Kwakernaak (Leiden University and AMOLF Amsterdam) have published about this latest metamaterial ...

Flushing toilets create clouds of virus-containing particles

Researchers used a computer simulation to show how a flushing toilet can create a cloud of virus-containing aerosol droplets that is large and widespread and lasts long enough that the droplets could be breathed in by others.

Electromagnetic water cloak eliminates drag and wake

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while simultaneously helping it avoid detection.

Using a public restroom? Mask up!

Think you don't need to worry about COVID-19 while using a public restroom? A group of researchers from Yangzhou University in China recently reported that flushing public restroom toilets can release clouds of virus-laden ...

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