Technology

But critics caution the online test isn’t quite ready for prime time

When tuned up, old algorithms can match the abilities of their successors

Digital contact tracing could help stop viral spread—but it has yet to prove its worth

New program aims to have two prototype reactors running within 7 years

Approach could be used to follow other species’ response to human activities over decades

Sifting people’s digital tracks could flag hot spots, but won’t replace testing for virus

Technology avoids obstacles by sensing air flow disruptions

The public will help judge the resulting lyrics and melodies

Advance replicates decades of AI research in days

Researchers strategize ways to trace infections and contacts amid data protection laws

With only electric fields, researchers flip a single nucleus in a silicon chip

Devices that forgo expensive metals could turn renewable electricity into hydrogen

Approach could make manipulating a prosthesis more natural, precise, and reliable

European Commission’s artificial intelligence plan also promises to pump billions into R&D

Engineered microbes shift from making molecules to materials

Scientists entangle atoms through tens of kilometers of standard optical fiber