Superhydrophobic surfaces—those famously "never-wet" materials that make water bead up and roll away—have a stubborn weakness: hot water. Once temperatures climb above roughly 40 degrees Celsius, many ...

Machine learning is the ability of a machine to improve its performance based on previous results. Machine learning methods enable computers to learn without being explicitly programmed and have ...

November 24, 2025 • Our annual reading guide returns with 380+ new titles handpicked by NPR staff and trusted critics. Find 13 years of recommendations all in one place — that's more than 4,000 great ...