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Exposure notification systems alert people when they’ve been exposed to the coronavirus but don’t record the information. AleksandarGeorgiev/E+ via Getty Images

How Apple and Google let your phone warn you if you’ve been exposed to the coronavirus while protecting your privacy

Bluetooth wireless communication makes it possible to track when people have been exposed to people infected with the coronavirus. The right cryptography scheme keeps alerts about exposures private.
Military units like the 780th Military Intelligence Brigade shown here are just one component of U.S. national cyber defense. Fort George G. Meade Public Affairs Office/Flickr

The SolarWinds hack was all but inevitable – why national cyber defense is a ‘wicked’ problem and what can be done about it

Fragmented authority for national cyber defense and global supply chains for building software stack the deck against US cybersecurity.
It’s disconcerting to think the way two people perceive the world might be totally different. Mads Perch/Stone via Getty Images

Do you see red like I see red?

Neuroscientists tackling the age-old question of whether perceptions of color hold from one person to the next are coming up with some interesting answers.
Being a good mother depends on many factors, including the the bacteria in the mouse mother’s gut. IvonneW/iStock/Getty Images Plus

In mice, a mother’s love comes from the gut

Microbes can alter the minds of mouse mothers and disrupt their natural instinct to nurture their young.
A person falling into a black hole and being stretched while approaching the black hole’s horizon. Leo Rodriguez and Shanshan Rodriguez

Could a human enter a black hole to study it?

If you are a sci-fi junkie you've probably wondered what would happen if you were unlucky enough to fall into a black hole. How well you'd fare all depends on the type of black hole.