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Science + Tech – Articles, Analysis, Opinion

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Neural networks try to simulate the brain by processing data through layers of artificial neurons. MF3d / E+ via Getty Images

What is a neural network? A computer scientist explains

Neural networks today do everything from cameras to translations. A professor of computer science provides a basic explanation of how neural networks work.
Several countries are developing microwave weapons, like this U.S. Air Force system designed to knock down drones by frying their electronics. AFRL Directed Energy Directorate

Experts suggest US embassies were hit with high-power microwaves – here’s how the weapons work

High-power microwave weapons are useful for disabling electronics. A new report says they ‘plausibly explain’ some ailments suffered by US diplomats and CIA agents in Cuba, China and other countries.
Even if every country meets its commitments, the world will still be on track to warm by more than 3 degrees Celsius this century, a new UNEP report shows. Kevin Frayer/Getty Images

5 years after Paris: How countries’ climate policies match up to their promises, and who’s aiming for net zero emissions

Bold visions for slowing global warming have emerged from all over the world. What’s not clear is how countries will meet them.
Whether in the wild or in the lab, worms have an interesting story to tell. Sinhyu/iStock via Getty Images

Why do scientists care about worms?

‘Worm’ is really a catchall term for a huge variety of animals with different characteristics that span the tree of life. They hold clues about our own origins as well as hints about human health.
Missing a field season can be devastating if your research subject is melting away. Karen Lloyd

From permafrost microbes to survivor songbirds – research projects are also victims of COVID-19 pandemic

Three scientists describe the fieldwork they’ve had to delay in 2020 because of the pandemic. These are setbacks not just for their careers, but for the body of scientific knowledge.
A variety of clues can tip off archaeologists about a promising spot for excavation. Gabriel Wrobel

How do archaeologists know where to dig?

Archaeologists used to dig primarily at sites that were easy to find thanks to obvious visual clues. But technology – and listening to local people – plays a much bigger role now.
Some places, like Nazaré Canyon in Portugal, produce freakishly huge waves. AP Photo/Armando Franca

What makes the world’s biggest surfable waves?

Some beaches in the world tend to consistently produce huge waves. Places like Nazaré Canyon in Portugal and Mavericks in California are famous for their waves because of the shape of the seafloor.
A tiger’s vertical stripes help it blend in with trees and grasses in its homelands in Asia. Frédéric Soltan/Corbis via Getty Images

Why do tigers have stripes?

How do tigers – a top predator – successfully hunt their prey when they have bright orange fur? The secret’s in their stripes!