When Hanna Wallach first started testing machine learning models, the tasks were well-defined and easy to evaluate. Did the model correctly identify the cats in an image? Did it accurately predict the ...

Experts say gait speed, grip strength, balance, and endurance are some of the strongest predictors of long-term independence. Here’s how to check them yourself—and what the results mean. Balancing on ...

Warm dense matter is a state of matter that forms at extreme temperatures and pressures, like those found at the center of most stars and many planets, including Earth. It also plays a role in the ...